It is a bug, it will NOT result in bans, to prevent this bug you have to restrict a guardians class, they aren't able to use the swarm grenade and Achlyophage, nighthawk, claws of ahamkara, or any legendary with the perk, this could prevent someone being level 34, which is not fair in trials. It IS a broken mechanic and DOES need to be fixed soon. You will NOT be banned for this. They WILL warn you in the NEXT weekly update if it is a ban worthy bug, but we all know that they know it's not an appropriate response to the issue.