Simplify.

packages/editor/src/lib/editor/Editor.ts

@@ -1182,7 +1182,7 @@ export class Editor extends EventEmitter<TLEventMap> {
 		partial: Partial<Omit<TLInstance, 'currentPageId'>>,
 		historyOptions?: TLCommandHistoryOptions
 	): this {
-		if (partial.isReadonly === false && this.getInstanceState().isReadonly === true) {
+		if (partial.isReadonly === false && this.getInstanceState().isReadonly) {
 			const { isReadonly: _isReadonly, ...rest } = partial
 			this._updateInstanceState(rest, { ephemeral: true, squashing: true, ...historyOptions })
 		} else {