*appease-gnus* keeps popus while reading mails in mu4e

Whenever I'm reading emails in mu4e I get a popup (op top, which steals cursor) for *appease-gnus* buffer. I do not use gnus, and have never configured it. Apparently I'm not alone in this either --> https://teddit.net/r/emacs/comments/q1podp/mu4e_new_message_view_popping_window_appeasegnus/

Fix provided within the discussion has worked for me, but its good to fix it at source.

More details:
OS: NixOS Unstable
Emacs 29.0.50 with --with-native-compilation
Doom-emacs develop branch

I do not know what else could be the cause, but can test/provide logs if needed