So this is a ‘new’ behavior and I blame LSCache. New being, not sure when it came into being.
We noticed it on a testing server here. It did not appear in pre-production or in production because those environments have locked down file permissions, and LSCache couldn’t meddle with the Redis Object Cache file (wp-content/object-cache.php).
@saveatrain as mentioned by the author, I stick to Redis Object Cache and disable object cache in LSCache.