diff --git a/src/addons/calendar/components/filter/filter.html b/src/addons/calendar/components/filter/filter.html
index ba83242d3..dcd796e44 100644
--- a/src/addons/calendar/components/filter/filter.html
+++ b/src/addons/calendar/components/filter/filter.html
@@ -2,7 +2,7 @@
     <ion-toolbar>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/addons/messages/pages/discussion/discussion.scss b/src/addons/messages/pages/discussion/discussion.scss
index 2de83952c..b7a8a53df 100644
--- a/src/addons/messages/pages/discussion/discussion.scss
+++ b/src/addons/messages/pages/discussion/discussion.scss
@@ -23,16 +23,16 @@
         color: var(--addon-messages-discussion-badge-text);
         background-color: var(--addon-messages-discussion-badge);
         display: block;
-        @include position(0, 0, null, null);
+        @include position(0px, 0px, null, null);
     }
 
     ion-header ion-toolbar ion-title {
-        padding: 0;
+        padding: 0px;
 
         h1 {
             display: flex;
             align-items: center;
-            padding: 0;
+            padding: 0px;
 
             .core-bar-button-image {
                 @include margin-horizontal(null, 6px);
diff --git a/src/addons/mod/book/components/toc/toc.html b/src/addons/mod/book/components/toc/toc.html
index e68109ac6..1cf3aeba0 100644
--- a/src/addons/mod/book/components/toc/toc.html
+++ b/src/addons/mod/book/components/toc/toc.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/addons/mod/data/components/search/search.html b/src/addons/mod/data/components/search/search.html
index 34b019cc4..e855001b6 100644
--- a/src/addons/mod/data/components/search/search.html
+++ b/src/addons/mod/data/components/search/search.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/addons/mod/imscp/components/toc/toc.html b/src/addons/mod/imscp/components/toc/toc.html
index c8251314d..86cdc185f 100644
--- a/src/addons/mod/imscp/components/toc/toc.html
+++ b/src/addons/mod/imscp/components/toc/toc.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/addons/mod/workshop/components/phase/phase.html b/src/addons/mod/workshop/components/phase/phase.html
index 5fce6d779..ce7f3ab40 100644
--- a/src/addons/mod/workshop/components/phase/phase.html
+++ b/src/addons/mod/workshop/components/phase/phase.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/addons/notes/components/add/add-modal.html b/src/addons/notes/components/add/add-modal.html
index e247a4fb2..20012aac4 100644
--- a/src/addons/notes/components/add/add-modal.html
+++ b/src/addons/notes/components/add/add-modal.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/core/features/block/components/side-blocks/side-blocks.html b/src/core/features/block/components/side-blocks/side-blocks.html
index 6b2f37b59..a76529bb2 100644
--- a/src/core/features/block/components/side-blocks/side-blocks.html
+++ b/src/core/features/block/components/side-blocks/side-blocks.html
@@ -2,7 +2,7 @@
     <ion-toolbar>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/core/features/policy/components/policy-modal/policy-modal.html b/src/core/features/policy/components/policy-modal/policy-modal.html
index b555e7f34..412885f05 100644
--- a/src/core/features/policy/components/policy-modal/policy-modal.html
+++ b/src/core/features/policy/components/policy-modal/policy-modal.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/core/features/policy/pages/site-policy/site-policy.html b/src/core/features/policy/pages/site-policy/site-policy.html
index 8054a867e..b559ecb41 100644
--- a/src/core/features/policy/pages/site-policy/site-policy.html
+++ b/src/core/features/policy/pages/site-policy/site-policy.html
@@ -10,7 +10,7 @@
 
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="cancel()" [attr.aria-label]="'core.cancel' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/core/features/search/components/global-search-filters/global-search-filters.html b/src/core/features/search/components/global-search-filters/global-search-filters.html
index 61d0c466f..16c70b736 100644
--- a/src/core/features/search/components/global-search-filters/global-search-filters.html
+++ b/src/core/features/search/components/global-search-filters/global-search-filters.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="close()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/core/features/sharedfiles/components/list-modal/list-modal.html b/src/core/features/sharedfiles/components/list-modal/list-modal.html
index 8b1161c97..49c0406f0 100644
--- a/src/core/features/sharedfiles/components/list-modal/list-modal.html
+++ b/src/core/features/sharedfiles/components/list-modal/list-modal.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/core/features/viewer/components/qr-scanner/qr-scanner.html b/src/core/features/viewer/components/qr-scanner/qr-scanner.html
index 3fc073023..82bc299d9 100644
--- a/src/core/features/viewer/components/qr-scanner/qr-scanner.html
+++ b/src/core/features/viewer/components/qr-scanner/qr-scanner.html
@@ -5,7 +5,7 @@
         </ion-title>
         <ion-buttons slot="end">
             <ion-button fill="clear" (click)="closeModal()" [attr.aria-label]="'core.close' | translate">
-                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden=true />
+                <ion-icon name="fas-xmark" slot="icon-only" aria-hidden="true" />
             </ion-button>
         </ion-buttons>
     </ion-toolbar>
diff --git a/src/core/services/utils/utils.ts b/src/core/services/utils/utils.ts
index 9b68444a5..e2c4b89a4 100644
--- a/src/core/services/utils/utils.ts
+++ b/src/core/services/utils/utils.ts
@@ -1387,7 +1387,6 @@ export class CoreUtilsProvider {
      * @param data Object.
      * @param prefix Prefix to add.
      * @returns Prefixed object.
-     * @deprecated since 4.4. Not used anymore.
      */
     prefixKeys(data: Record<string, unknown>, prefix: string): Record<string, unknown> {
         const newObj = {};
diff --git a/src/theme/components/discussion.scss b/src/theme/components/discussion.scss
index c1b40616e..7ee9d3d2c 100644
--- a/src/theme/components/discussion.scss
+++ b/src/theme/components/discussion.scss
@@ -1,7 +1,7 @@
 :host-context(.ios) {
     ion-footer .toolbar:last-child {
         padding-bottom: 4px;
-        min-height: 0;
+        min-height: 0px;
     }
 }
 
@@ -10,7 +10,11 @@ ion-content {
     --background: var(--content-background);
 
     &::part(scroll) {
-        padding-bottom: 0 !important;
+        padding-bottom: 0px !important;
+    }
+
+    core-empty-box {
+        --core-empty-box-icon-color: var(--dark);
     }
 }