Just for the record, I’m having a similar result. I am slicing procedural meshes and keeping track of the slices so that I can spawn a new actor with the same parts history of slicing.
When I disable physics on the procedural mesh or add breakpoints to the Slice nodes, everything works.
When I enable physics and don’t hit any breakpoints, the child actors seem to ‘forget’ previous slices or fail to spawn.
I’m thinking there must be some sort of race condition and hitting the breakpoint allows a variable to resolve somewhere, but I can’t figure out where.
So you’re not alone OP, although it doesn’t seem like this post is getting much attention.