After the bat binary was renamed from batcat to bat and back to batcat, the man page is no longer installed:
This appears to have not been directly related to the renames, instead it appears that Sylvestre disabled the manpage in version 0.18.3-1, unfortunately the commit message does not say why. https://salsa.debian.org/rust-team/debcargo-conf/-/commit/82afeef244ea59a98d9d3209d485e85bcc6bc38f
