Accessory Plothole?

Maybe I missed something but why was Thanos able to still have his jewelry when he entered the game? Same thing with the elderly woman’s hair pin and - more loosely - Hyun-yu’s hair tie.

I thought in Season 1, they stripped the contestants of off their items to make them equal. In the first season, they smuggled items inside but - this time - it seems like the workers didn’t do their jobs or the writers forgot this piece of lore