fix(textarea): Stale internal input reference when switching between themes (#1901)

(cherry picked from commit d4560eb)

Author: rkaraivanov

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [6.3.4] - 2025-10-22
+### Fixed
+- #### Date picker
+  - Issues when clearing the value and notch border in Material theme [#1894](https://github.com/IgniteUI/igniteui-webcomponents/pull/1894)
+- #### Textarea
+  - Stale internal input reference when switching between themes
+
 ## [6.3.3] - 2025-10-14
 ### Fixed
 - #### Chat
@@ -1043,6 +1050,7 @@ Initial release of Ignite UI Web Components
 - Ripple component
 - Switch component
 
+[6.3.4]: https://github.com/IgniteUI/igniteui-webcomponents/compare/6.3.3...6.3.4
 [6.3.3]: https://github.com/IgniteUI/igniteui-webcomponents/compare/6.3.2...6.3.3
 [6.3.2]: https://github.com/IgniteUI/igniteui-webcomponents/compare/6.3.1...6.3.2
 [6.3.1]: https://github.com/IgniteUI/igniteui-webcomponents/compare/6.3.0...6.3.1

src/components/textarea/textarea.spec.ts

@@ -149,6 +149,21 @@ describe('Textarea component', () => {
       expect(prefixPart.hidden).to.be.true;
       expect(suffixPart.hidden).to.be.true;
     });
+
+    it('correctly recreates internal input query after re-renders', async () => {
+      element = await fixture(html`<igc-textarea></igc-textarea>`);
+      textArea = element.renderRoot.querySelector('textarea')!;
+
+      // Switching to material creates a new internal template with another textarea...
+      configureTheme('material');
+      await elementUpdated(element);
+
+      // ..thus the previously referenced non-material textarea should not match the internal query
+      expect(textArea !== (element as any)._input).to.be.true;
+
+      configureTheme('bootstrap');
+      await elementUpdated(element);
+    });
   });
 
   describe('Events', () => {

src/components/textarea/textarea.ts

@@ -111,7 +111,7 @@ export default class IgcTextareaComponent extends FormAssociatedRequiredMixin(
     onChange: this._handleSlotChange,
   });
 
-  @query('textarea', true)
+  @query('textarea')
   private readonly _input!: HTMLTextAreaElement;
 
   protected override get __validators() {