PS4 pro. Unfortunately, no set up and I don't have many details.

Basically the first roaming axeman in ch13 aggro'd as normal, during my first (and only) playthrough. But subsequent guards would not aggro at all, and for the rest of the chapter I seemed to have no hitbox (no enemies could hit me.) Other enemies aggro'd as normal.

If this is reproducible, would save needing to alterna the roaming guards.