BSP brush faces dissapearing for no reason

KarloRK0712
Fri, 06 Oct 2023 16:32:03 +0000
World Creation

So, I was working on a map with BSP brushes, everything was fine until one morning I woke up, went to work and for some reason the majority of the BSP brushes that made up the map didn’t have the majority of their faces.
I recently switched my project’s version from 4.26 to 4.27 but it worked fine when I did it. Only after a few days this happened and for no apparent reason.

Any help is appreciated!

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