How do I fix Bluetooth audio not working for only some apps?

I have a pair of Sony Bluetooth headphones, and they work perfectly with my phone (Moto G30) for Spotify and YouTube. However, audio does not play through them for some other apps (BaconReader and Polytopia, to name two). When I have one of these apps open and I turn the volume up, the audio pop-up shows the master value turning up, but the app in question's audio slider is still stuck at the bottom. If I manually try to slide it up, it just jumps back to the bottom. This doesn't happen with my wired earphones, and I do not have another Bluetooth headset to test on. I have "forgotten" the headphones and repaired them to no avail. Restarting my phone doesn't help. Killing the apps and starting them again doesn't help. Anything else I can try?