We experienced Redis lock cannot be released. It is suggested to review and enhance the Redis session handler class so as to have better error handling when it is failed to release lock.  

If this case happens, instead of relying on $SESSION->id to get the sid, it can also get the sid from cookie MOODLESESSION and try the best to release Redis lock.

This is the Moodle environment that is using.
Moodle 4.1.3
PHP 7.4.33
MYSQL 8.0.39
Redis cache