As mentioned above, I decided to start 2026 by factory resetting my Pixel 8a. Restored from Seedvault backup with minimal issues. I can definitely see there it's become more stable from the last time I restored from backup, so hats off to the GrapheneOS team for the minor/gradual improvements over last year.
Main issues I experienced was with SV restored Proton Mail & Calendar apps as they kept crashing and enabling Exploit Protection Compatibility Mode didn't help. So I had to reinstall them, all other Proton apps had no issues though.
The other issue was restoring WhatsApp from backup. But I figured that out after about 5 attempts