Some, primarily older designs, use rubber or neoprene washers which tighten against a "seat" and block the flow water. If you have room arrange lightly scented candles on a tray close to the tub, on the counter or window sill. If there are any leaks near the arms, the washer are going to be renewed. https://www.stephilareine.com/2023/09/common-mistakes-made-with-tile-regrouting.html