Hello there, I am happily running /e/ since over a month on my new OP6.
I installed /e/ starting from Android 10 and went through various issues before finally succeeding, see [HOWTO] Install /e/ on OnePlus 6 running Andoroid 10
This is a necessary detail because in order to install this OS I had to flash a more recent version of TWRP, specifically twrp-3.3.1-16-enchilada-installer-mauronofrio.zip.
In my setup, that in all ways work perfectly, when I try to upgrade /e/ using OTA, it always fails.
The initial preparations executed while Android is running seem to succeed, but when I reboot it gets stuck at the bootloader. At that point, I can choose to launch recovery, which instead of TWRP, that was previously installed, is Lineage OS Recovery.
In other words, the OTA upgrade of /e/ wipes my TWRP and installs LOS Recovery instead. This in turn impedes the completion of the upgrade.
In order to upgrade /e/ I always have to do it manually using adb sideload </e/_release.zip> from within the LOS Recovery and then restore TRWP using the same method.
Is it only me having issues with OTA upgrade? Could it be because of the TWRP version I am using?
When I tried to use the latest official TWRP for Enchilada of July 2019 it could not decrypt the filesystems, hence had to take a more recent, unofficial, one.