I did some testing with the following results:Here you go, and thanks for digging into this.
lineage-19.1-20230112-UNOFFICIAL-ali.zip
sha256sum:f9ab1f76dae559c9dc9c6de5ec549579a5a0106a79d9e1d66ee53a121b1353ce
Kind regards,
FWieP
Not depending if encrypted or not:
When installing the phone newly and you select the option to "update Lineageos-Recovery with the operating system" TWRP will be "deleted" with the consequence you cannot boot into recovery.
Even if you install it again and boot afterwards into Lineageos it will be deleted again.
So I think this should go as an advise to the first page that it is very advisable not to select this option as OTA will of course not work with a non existing TWRP.
Encryption and OTA / Update
You cannot update with OTA and I was not able to do this even manual with the update on a Micro-SD card. It gave the same errors as with the OTA that /data (and another partition - which I don't remember) cannot be mounted and infinite boot loop afterwards.
It seems that it is an issues with Android 12 and also TWRP needs to support the encryption which seems not the case with the G6 version as you cannot manually mount /data. It seems there are patched TWRP for other version which can access /data and ask for the password to decrypt it.