wpview editor plugin (that is responsible for showing gallery, video, audio, and oEmbed previews) was updated to use the TinyMCE API for non-editable elements. This brought some small changes and improvements in the UI, for example “views” are draggable now. On the back-end the
wp-mce-view-unbind event was removed as it doesn’t exist in the API. It was intended for cleanup/unloading but was never very reliable. If a plugin needs to unload instance dependent scripts, it can use mutation observer to monitor when the view node is deleted. See #36434 for more information.
wpview remains an experimental API, though with each iteration it is getting closer to being finalized. As an experimental API, breaking changes are expected. As always, please test your plugin now if it modifies or depends on the editor, especially if you use experimental features like