I am submitting this here because it can’t really be tested in a bug report. Periodically, the room placement tool will get stuck on “room too small”. See below:
We found what it was and will fix it. If you go from the template tool (copy-paste tool) and without deselecting it, chose a room type to place and then trying to place it, this will happen. Took a while to figure it out but will fix it asap