diff --git a/packages/coding-agent/src/modes/interactive/interactive-mode.ts b/packages/coding-agent/src/modes/interactive/interactive-mode.ts
index a596eea88..7b3b45ba9 100644
--- a/packages/coding-agent/src/modes/interactive/interactive-mode.ts
+++ b/packages/coding-agent/src/modes/interactive/interactive-mode.ts
@@ -2839,8 +2839,12 @@ export class InteractiveMode {
 		// Save text from current editor before switching
 		const currentText = this.editor.getText();
 
-		this.disposeActiveSelector();
-		this.editorContainer.clear();
+		// An open extension dialog keeps the editor slot; the new editor is shown when the last dialog closes.
+		const dialogOpen = this.extensionDialogs.length > 0;
+		if (!dialogOpen) {
+			this.disposeActiveSelector();
+			this.editorContainer.clear();
+		}
 
 		if (factory) {
 			// Create the custom editor with tui, theme, and keybindings
@@ -2898,7 +2902,7 @@ export class InteractiveMode {
 			this.editor = this.defaultEditor;
 		}
 
-		this.editorContainer.addChild(this.editor as Component);
+		if (!dialogOpen) this.editorContainer.addChild(this.editor as Component);
 		if (this.activeStatusIndicator) {
 			this.statusContainer.clear();
 			this.activeWorkingIndicatorEmbedded = this.setEditorWorkingStatusIndicator(this.activeStatusIndicator);
@@ -2906,7 +2910,7 @@ export class InteractiveMode {
 				this.statusContainer.addChild(this.activeStatusIndicator);
 			}
 		}
-		this.ui.setFocus(this.editor as Component);
+		if (!dialogOpen) this.ui.setFocus(this.editor as Component);
 		this.ui.requestRender();
 	}
 
diff --git a/packages/coding-agent/test/interactive-mode-extension-dialogs.test.ts b/packages/coding-agent/test/interactive-mode-extension-dialogs.test.ts
index d296ff2b4..2a59f9189 100644
--- a/packages/coding-agent/test/interactive-mode-extension-dialogs.test.ts
+++ b/packages/coding-agent/test/interactive-mode-extension-dialogs.test.ts
@@ -19,6 +19,9 @@ type DialogMethods = {
 	showExtensionCustom<T>(
 		factory: (tui: unknown, theme: unknown, keybindings: unknown, done: (result: T) => void) => Component,
 	): Promise<T>;
+	setCustomEditorComponent(
+		factory: ((tui: unknown, theme: unknown, keybindings: unknown) => Component) | undefined,
+	): void;
 };
 
 function createContext(): DialogContext & DialogMethods {
@@ -149,4 +152,24 @@ describe("InteractiveMode extension dialogs", () => {
 		await expect(custom).resolves.toBe("kept");
 		expect(context.focused).toBe(context.editor);
 	});
+
+	// Regression for #11431: replacing the editor while a dialog was open hid the dialog and left it unanswerable.
+	it("keeps an open dialog visible when the editor component is replaced", async () => {
+		const context = createContext();
+		(context as unknown as { defaultEditor: unknown }).defaultEditor = context.editor;
+		const confirmed = context.showExtensionConfirm("Title", "Continue?");
+		const customEditor: Component & { getText(): string; setText(text: string): void } = {
+			render: () => ["custom editor"],
+			invalidate: () => {},
+			getText: () => "",
+			setText: () => {},
+		};
+		context.setCustomEditorComponent(() => customEditor);
+
+		expect(visible(context)).toContain("Title");
+		context.focused?.handleInput?.("\r");
+		await expect(confirmed).resolves.toBe(true);
+		expect(context.focused).toBe(customEditor);
+		expect(context.editorContainer.children).toEqual([customEditor]);
+	});
 });