@zxurian – Thanks for your post, and for taking the time to find this topic and do your research.
You wrote “I can’t confirm if it’s directly related to ACF or not.” The issue fixed in the latest Development Version is not specific to ACF; it can happen to anyone.
You wrote “but didn’t see any explicit reference to a fix other then downloading a separate “Disable Gutenberg” plugin“. The only fix required is to install the MLA Development Version. The “Disable Gutenberg” plugin is not required.
You asked “Is this fix part of the next planned release?” The short answer is yes, although I do not have a scheduled release date at this time.
You observed “ it just asks me if I want to replace the existing MLA plugin. That is correct; the Development Version replaces the existing version. Step two of the instructions says “Find Media Library Assistant and delete it. You will not lose any settings.”
The latest Development Version has very minor changes from the current “official” version, and you can use it with confidence until it is automatically replaced by the next MLA update. You can always delete it and re-install the official version if you need to.
I hope that answers your questions. If you have any problems or further questions regarding the fix or the Development Version, post an update here. It would be great to know if the Development Version resolves your problem! Thanks for your interest in the plugin.