Guide has been updated to reflect changes as DP4 is now working.
To update from DP3 to DP4, you can do so without wiping data:
Wipe system and vendor ONLY
Flash DP4 GSI
Flash Post GSI 1 (FP/Nav Bar/BT fix)
Does this rom have a volum panel tile?
had the same problem, what helped me
1. flash Magisk uninstaller in TWRP
2. reboot to TWRP
3. flash Magisk 19.3
4. reboot to TWRP
5. flash latest Canting kernel downloaded from GitHub (do the download right now, in order to get the very lates...