I am in a localhost test environment updating from phpBB 3.2.5 to 3.2.6. I clear the cache with the command line interpreter as:
>php bin/phpbbcli.php cache:purge
[OK] Cache successfully purged.
The /cache/production directory is not removed. I remove the files as:
>rm -rf cache/*
After updating to phpBB 3.2.6, the command line interpreter leaves a single file in the /cache directory. Alternatively, the /cache/production directory will remain.
I can repeat this behavior in the Administration Control Panel --> Purge the cache.
I expect a cache purge to remove all files in the /cache directory.