Unable to close brep with cap holes

No I didn’t try this. In fact this question is related to another question I posted a while ago. Back then I had some issues when using solid union, and this problem was caused by the fact that i lowered the absolute tolerance. https://discourse.mcneel.com/t/not-able-to-join-large-amount-of-breps-with-solid-union/99754/4?u=toms