It’s well known the bluetooth on rpi sucks and just can’t handle audio over a certain bitrate. Lots of threads about this before.
Never used BT audio +RPi, but I've read the audio jack is crap too. Btw I guess you can get rid of this patch LibreELEC.tv/pulseaudio-0900.03-eliminates-lags-after-bluetooth-packet-loss.patch at le82 · escalade/LibreELEC.tv · GitHub
IMHO it doesn't really do what it should if you compare it to LibreELEC.tv/pulseaudio-0900.03-eliminates-lags-after-bluetooth-packet-loss.patch at master · LibreELEC/LibreELEC.tv · GitHub & it looks like pulseaudio v12.2 is already patched.
@Cael
Do you use your Wifi while you play music over BT? Can you disable it & try again?