The Bucks guaranteed his contract, but it might only be to use him in trades.
The Milwaukee Bucks had a chance to part with Amir Coffey before his contract became guaranteed, but they didn't. Instead, the forward, who has scarcely played for the team this season, is staying put... for now. Guaranteeing Coffey's contract doesn't mean the Bucks believe in the forward as a win-now contributor. It's far more likely that they plan to use him as a trade chip when the opportunity arises.