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Probably all platforms - Killer powers allowing them to ignore pallet stuns.
Observed and replicated on Nemesis, Nurse and Legion.
Holding/activating powers the instant that a pallet stun would occur[able to predict and as such able to abuse semi-reliably] allows the killer to ignore the stun entirely, probably tied to fixing killers being softlocked inside of ability uses when stunned. TIMING APPEARS TO BE VERY SPECIFIC, but could easily be reliably replicated.
Example of a real and specific case being: Nurse blinks to survivor camping a pallet, nurse begins to channel second blink to get out of pallet/hit person but is pallet stunned. Survivor gets the Killer Stun score notification but the killer does not get stunned.
Similar interaction with Nemesis: Simply walking into a pallet and getting ready to use whip and then being stunned will often prevent the stun, still giving Killer Stun score card for the survivor.
Legion trying to fake a pallet and just walking into it and tapping their power has a similar potential effect as above.
I imagine the cause for this bug is due to changes made to avoid killers being able to be softlocked by being stunned while using their power. (Very notable and frequent around the release of Pinhead.)