Well, at least it’s not a new bug. That’s something. Will look into it, but as I showed on the roadmap, want to dedicate more time on getting the features up and running and doing the bugfixing at last. I worked around that just by being careful and closing the mat editor when i went to the viewport. I know it’s annoying, but just have two hands 
EDIT: If you find it to be too bad, maybe it works worst on you system, tell me, will look into it