I'm running a OnePlus 9 with the stock recovery, but a patched boot image to allow Magisk and, importantly, Magisk hide. I've been running the phone that way since getting it about a month ago. I've had no problems since then but it was running a little slow so I wanted to clear the device cache. I did so from the stock recovery, went to reboot, and...couldn't. Every time, no matter what, it boots back to the recovery. I tried reflashing the boot image (patched and non-patched) which didn't work but eventually I found a sort of fix.

At this point I was resigned to losing my data to an MSM fix so I tried resetting the userdata partition which shockingly worked. Well, it worked until the next time I went into the recovery. Doing another reset has continued to let me fix it, but again, only until I boot back into the recovery where the problem shows up again.

I'm about to go through with an MSM fix but I'm curious if this is an issue with my device specifically? Is there something obvious I missed? I'd love some advice on what else I might've tried as well if this is a problem I should be worried about in the future and, especially, if this is a known issue that should make me avoid rooting.

I realized I should've mentioned this, but for anyone curious, the error code I get is "fs_mgr_mount_all" which hasn't been very helpful at all when I've tried to google around.