Subdiv/Sides count -> faces disappear

Why is this happening?


and this is not the only problem, similar problems happens with connecting edges and other operations, in a word, my probuilder is completely broken…

Hi @nbg_yalta , that looks very strange indeed. Have you tried switching to wireframe draw mode when this reproduces? I’m curious if the missing geometry just doesn’t render or if it’s actually missing. Also, any change you could archive the project and share it here?