Quick answer: Unreal physics asset cooked iOS missing physics materials? Cook flag per-platform; some materials excluded - add to mobile cook list.
iOS NPC physics bodies use default friction; PC uses authored materials.
Add to cook list
DefaultGame.ini's mobile platform list; include physics materials.
Or hard-reference
Physical material referenced from a cooked actor; cooker walks to include.
Verify cooked content
Per-platform cook output; physical materials present.
“Per-platform cook excludes some assets. Physical materials are often missed.”
If your mobile build has physics regressions, the per-platform asset audit is mandatory.