I used to have this problem with my old S8+, where getting into a call would cause the entire phone's media output to go into "call mode" and my music would sound awful. The S21 fixed this with its separate audio channels, at least when using my wired headphones with a USB-C dongle. However, I just got the Galaxy Buds Pro and the same issue has resurfaced, only with the bluetooth earbuds. My wired headphones are still fine when listening to music during a call.
Any idea how to fix this? The Galaxy Buds are pretty much unusable for me with this issue present