I believe I am also experiencing this issue. I still have hardlock with “Sqlite3: Sleeping for 200ms to retry busy DB.” in my plex server log AFTER deleting the docker, replacing the cache drive, and recreating the whole database from scratch. This crashes in such a way that the unraid docker cannot be shutdown or restarted, and the server is unable to shutdown cleanly either, meaning each troubleshooting step is separated by a 2.5 day parity check. Extremely frustrated at the moment . .
I do not run PMM and I’m experiencing SQLITE lockups on the latest Beta releases. I’ve tested this across 2 different installations. Something is borked in this release.
For me it’s solved the DB lockups. I have a large library and if my DB gets malformed in anyway then DB scans cause my DB to crash. The only fix is to either nuke the entire DB instance and start fresh or implement the autoscan tool alongside weekly DB repairs using the PlexDBRepair script.