ContextualBalloon errors (remove-view-not-exist) when inserting Images via IMCE inside Templates

Problem/Motivation

In Chrome (but not Firefox), inserting an image via IMCE into a previously inserted Template (from the Templates submodule) triggers a contextualballoon-remove-view-not-exist error. Subsequent image insertions then fail with collection-remove-404.

Steps to reproduce

Environment: Drupal 10.5.x | CKEditor v45.2.2 (v44.0.0 worked fine)
Browser: Chrome
Chrome -> Wysiwyg -> Responsive Columns (Success) -> Image 1 (Successfully placed image with an Error) -> Image 2 (Crash)

Technical Details: The error occurs because drupalImage.js and the Template plugin both attempt to manage the ContextualBalloon stack simultaneously. When the IMCE modal shifts focus, the balloon is auto-closed by the core. When balloon.remove(view) is subsequently called by the plugin, it crashes because the view is already gone.

Proposed resolution

Wrap balloon removal calls in a hasView() check:
if (this._balloon.hasView(this.templateView)) { this._balloon.remove(this.templateView); }