I created a looping door using b0: !(b0) equal. And for some reason on this one tile door that I was having it look like it was floating up and down in the air. It places a copy of itself seemingly every tick. I use that signal logic for other moving platforms and they have never duplicated.
Export:
dubbing door.txt

Will be fixed in the big release. Thank you very much for reporting it! Was actually a quite serious issue.

New version is out!