normally trespasser exotic perk chains into itself with kills however if you proc mechaneers tricksleeves first mechaneers will reload your trespasser on kill preventing it from chaining the higher damaging shot properly. i think that the gun is properly reactivating its perk but the auto reload on sidearm kill from mechaneers is undoing that chain. this has been in the game since at least 08-23-2024 when i last tried to make this build work.