I have a strange bugged teledoor that can't be hit with a wrench, hammer, or anything else. It can only be cleared by clearing all bricks. I've attached a save.
Unfortunately I don't remember how I made it.
It turns out you have to click on the back of the door to break or edit it.
Fake killed teledoors do temporarily turn black while respawning but I don't think that's a serious issue.