Geometry Collection Actors do not respond with the appropriate Actor nor Component for OnComponentHit events. Upon placing a breakpoint after following the steps to reproduce, you can see that the Other Actor nor Other Comp have valid data inside.
Repro Rate: 3/3
Tested this in //UE5/Release-5.0-EarlyAccess @ CL#16682836 and was able to cast successfully and get the appropriate data for Other Actor & Other Comp, it is a regression.
Results: Casting to the Geometry Collection Actor fails and no information can be obtained from the Other Actor.
Expected: Casting succeeds and information can be obtained from the Other Actor
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-149984 in the post.