For the 14.1 stuff I can do the logs when I’m back on 14.1.
As for 15.1 …
The few lines listed there under ADDITIONAL INFORMATION are not the recovery.log, but the TWRP console (?) output you can view with the button at the bottom right.
For Screen Lock in LineageOS 15.1 set to “None” it reads:
Failed to decrypt data.
Unable to decrypt with default password. You may need to perform a Format Data.
Updating partition details...
...done
Unable to mount storage
Full SELinux support is present.
At this point TWRP prompts for a decryption password, but there is none. Every attempt to enter one adds the following line to the output:
Failed to decrypt data.
For Screen Lock set to an actual lock (pattern/ PIN/ password) it reads
Updating partition details...
...done
Unable to mount storage
Full SELinux support is present.
At this point TWRP prompts for the decryption pattern/ password (TWRP doesn’t distinguish between PIN and password with this prompt, worked with PINs nonetheless in the past).
Every attempt to decrypt with the pattern/ PIN/ password given by the user adds the following line to the output:
Failed to decrypt data.
recovery.log for Screen Lock set to “None” … Edit: is on GitHub.
recovery.log for Screen Lock set to an actual lock … Edit: is on GitHub.