Depends we have multiple mathematical models for how wormholes work. Some models u cant cross through at all all. Some fuck with gravity so bad u would probably get Spaghetified. And some u wouldnt even notice except for the light looking all weird and cool af. There are multiple yt videos covering it including a really cool symulation iirc.
Its 50% air now. Costs the same price but half the cost u manufacture cos it half air. Good ol shrinkflation.