remove changes

Hi Daniel

I'll need nore info as we didn't had such issue before.
First please tell which plugins out od Plugin Pack selection do you use.
Second - there will be most probably a js error, so please share content of the browser developer console from after issue happens. As it is occuring on content save, please enable "Preserve log" first. This may provide enough info for us, so that will be what we need first. (Important mention - please disable JS aggregation, before collecting info from JS console)
The more detailed info, however possibly not needed at least at first - try to find out which exactly plugin causes that i.e. try to disable one after one and see after disabling which plugin the issue stops to occur. Also if you find that one please disable rest of Plugin Pack modules and check it that is solely one plugin causing problems. After that sharing your editor configuration will be helpful (editor.editor.full_html.yml in case the problems are with full html text format). If you don't use config sync folder, you can export single configuration in the admin UI.