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As far as the <IsAirtight> tag, it works by essentially ignoring the shape of your block and dealing with it as if it were a solid cube (or rectangular shape for 1x2 etc.). That means no air passes through it. It also means that if you're inside the bounding box of a window using it, there is no oxygen either.
That's how these items are set up, and consequently why the build states are also airtight. You cannot give a modded block buildstate an airtight tag, it just uses whatever tag the completed block has.
The vanilla blocks do not have either of these limitations, and it's unclear why / how they are different. This is the reason I've been putting off adding any blocks of a non-vanilla shape, as they would all have these issues. I am hopeful that Keen's new approach to community responses will help some of this get cleared up.