Error when using Mail Loop

CMK version: 2.4.0p8
OS version: Debian 12 with docker

Error message:Failed to check for mails: AssertionError(“Expected tuple with two elements, got (b’+OK 2 messages:‘, [b’1 39112’, b’2 3503’], 17)”)

I’m getting this error above when using Mail Loop.

I use it twice on is working the other on is not.
Sending via smtp without auth and receiving via pop3 with auth.

Was working in older versions without any issues.

Any Ideas?

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