Weird roof building 'logic'

I can stack regular roofs without issue, but when it’s a wedge some weird stability issues arise which make it impossible to build upwards. Some builds require using this, as shown in the screenshot below. Now I can build a wall under it and place the wedges, but when I remove the wall, they crumble to dust again. The neighboring wedges I placed on the wall have 80 stability, so how come there’s no stability left for the wedges that go on top of them? I can’t build from the top down either due to this same logic, leaving holes in my roof.

I can’t post a screenshot to illustrate because I’m a ‘new user’…

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