I just joined a public Crossplay match and ran into a PC guy who was switching Loadouts between several classes with Field Medic on, which shouldn’t be possible.
Since the Loadout files are saved locally they are prone to getting corrupted, I tried it myself and can use old loadout backups from when the perk costs were reduced, with perk combinations that shouldn’t be possible anymore.
I talked with the player and he told me he is using a cracked version of the game. He also sent me screenshots of other classes, like:
Support - Amphibious
Support - Sniper
Scout - Spotter
Scout - Deadly