diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/components/extension-slot/extension-slot.element.ts b/src/Umbraco.Web.UI.Client/src/packages/core/components/extension-slot/extension-slot.element.ts
index 2e3b3fd37f..f4e8f8679a 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/components/extension-slot/extension-slot.element.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/components/extension-slot/extension-slot.element.ts
@@ -102,6 +102,7 @@ export class UmbExtensionSlotElement extends UmbLitElement {
 	disconnectedCallback(): void {
 		this.#attached = false;
 		this.#extensionsController?.destroy();
+		this.#extensionsController = undefined;
 		super.disconnectedCallback();
 	}
 
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/components/extension-with-api-slot/extension-with-api-slot.element.ts b/src/Umbraco.Web.UI.Client/src/packages/core/components/extension-with-api-slot/extension-with-api-slot.element.ts
index d1c35b7e9c..4a3ef2eccb 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/components/extension-with-api-slot/extension-with-api-slot.element.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/components/extension-with-api-slot/extension-with-api-slot.element.ts
@@ -149,6 +149,7 @@ export class UmbExtensionWithApiSlotElement extends UmbLitElement {
 	disconnectedCallback(): void {
 		this.#attached = false;
 		this.#extensionsController?.destroy();
+		this.#extensionsController = undefined;
 		super.disconnectedCallback();
 	}