Please suggest somewhere else I should post this. I took an OTA update last night for Lineage4microG and my OnePlus8T just bootlooped. I tried downloading and manually side loading both the most recent and previous versions, but they keep failing with a kInstallDeviceOpenError. I am desperate to get back into my device without wiping the data.
Latest build had issues with a few models due to a selinx issue.
Flashing an older build should work tough. Try flash a selinux-permissive zip from recovery maybe, that should let you boot.
Next week build will fix the issue I am sure, but you should join the lineageos reddit channel or the discord server.