First off I hate the threat detector, it’s useless. A challenge to use the threat detector and get a headshot on a tagged spartan is already a frustrating prospect. It gets 1000x worse when the challenge just straight up doesn’t work. 3 times I’ve headshoted a glowing spartan, 3 times I didn’t get the challenge complete I just want a teensy dribble of progress, but the game just doesn’t like me I guess lol
Pretty much every challenge can be bugged, many people including myself are having trouble getting challenges to progress even though the requirements were met.