Bug in connecting rooms under doors?

[hansmex]

Emmanuel,

Recently I made a model where I used a self-made invisible doorframe/hatch to make an open connection between two rooms. After making some changes to the rooms, I noticed that the floors didn't connect correctly "under' the frame. I saved the model, re-opened it, deleted floors and inserted them again, but the problem is persistent.

When I make a new test model using the same frames, there is no problem, and floors are correctly connected.

I attach the file in question.

Hans

bug in floors?