I ran into a weird but similar issue, and one that might solve your problem…
When creating a wall with the new Cube Grid tool in the modelling tools found inside Unreal 5, it seems that it creates phantom, invisible meshes with full collision…ya, quite a bizarre side-effect
I had cut a hole into a Cube Grid block mesh, re-skinned with my chosen texture and for the life of me, I could not pass through the hole I had cut into it. It was driving me a bit batty, I have to say…
Then, reading this thread, I turned on the Collision view and there it was, not only one, but two complete, invisible collision meshes…quite mind-blowing really (I mean in terms of bugs, this is something else…)
Once I remove the two Collision fields, all was good, and I could go back to my game dev…
Hope it helps someone, somewhere 
Best,
Scott