[Rendar]

Critical Hit! Haunted Girl attacks Purple Suited Nurse with the transient melee and hits them!
Purple Suited Nurse takes 64 Blunt damage.
Haunted Girl's turn.
Critical Hit! Haunted Girl attacks Purple Suited Nurse with the red slash wave and hits them!
Purple Suited Nurse takes 83 Light damage.
Haunted Girl's turn.
Critical Hit! Haunted Girl attacks Purple Suited Nurse with the transient melee and hits them!
Purple Suited Nurse takes 98 Blunt damage.
Resist! Purple Suited Nurse takes 9 Wind damage.

Apparently somewhere in here I got stunned by skullcaver.

This didn't show on my list as me getting stunned.

Nor did I get stun immunity the turn after.

Bug? Probably.

[Sarinpa1]

I think that it occurs when the stun happens right as their turn ends.
IE in situations where you run out of momentum, so you don't have to manualy end turn.