When building, new projections can overlap. Welding those won't work correctly.
Submitted
The attached image shows two interior walls being placed as projections. The projections are overlapping, but can be placed anyway. When you go to weld them up, the first projection can be welded normally, but the second is still partly inside the just welded block and cannot be welded.
Desired behavior:
The game prevents projections from being placed inside existing projections or already welded blocks.
Files:
Overlapping int...
I have the same bug 
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