Ciao!
I did a new test of LOS 17 today, and here is my findings:
- “Split screen with multi-resume” is working
(see my other post) - Magisk is giving me root access (successfully tested with Titanium Backup)
- this root access can be hidden to certain apps (successfully tested with Pokémon Go)
- my banking app however is not working
, it detects that the device is rooted 
even if I selected it inside “Magisk Hide”…
Seems that my bank is getting really inventive with root detection, last version is detecting root also in my “LOS 16 + iSu” configuration, while previous version was working with it. - after restoring a TWRP backup, reboot is stuck , as already mentioned by @urs_lesse
I let it doing its animation for more that 15min but nothing…
However, if I do (1) TWRP restore + (2) Flashing LOS17 zip without wiping data, then the system is starting correctly , with all the apps/settings/… and without the “Finalizing configuration” message I had after the upgrade.
I searched the web for incompatibilities between TWRP and LOS17 but didn’t find any recent post, so I assume this bug is FP2-specific…
@z3ntu what could we do to debug this? Is there any logs usefuls?
What do you mean by “repatch the boot image”? My Magisk installation was two really easy steps: flashing Magisk-v20.2.zip in TWRP, then install the MagiskManager-v7.5.0.apk as a regular app…
I confirm that with the File-App, apk installation is possible, thank you for pointing that out 