Thanks for this workaround I was getting very frustrated because this also freezes the editor and I have fairly complex montages that needed to be fixed and wasnt sure what to do.
Something to add to this hotfix is when you re-import them to another location if you dont want to lose the way your current montages are setup (sections, notify tracks etc) you can just delete the old animation and replace the reference with the new one when it prompts during deletion phase.