My decay timer is set for the lowest .1
My stability multiplayer is set to lowest also.
I thought there was a disable decay timer at one time, but not seeing it now.
When i set stability to say 5, i couldn’t place any ceiling tile at all anywhere, it wouldn’t snap, i put it back to 0 and it would start working again.
Sadly though, it would not attach to that void area.
I am going to try and see if the triangle tiles might be the issue that are next to it.
If it turns out to be the case, then i will reply back here as having solved the problem.