There is an updated pull request by ericonr against master on the void-packages repository

https://github.com/ericonr/void-packages mandoc
https://github.com/void-linux/void-packages/pull/28252

mdocml: fix behavior when localized man pages are present.
Using the -a option with makewhatis(8) makes it scan every file under
the configured manpaths, instead of only the ones in directories that
match "man*". When localized man pages are present, this makes it so
files under the "$LANG/man*" directories are also indexed, which can
lead, as shown in #28146, to `man w3m` displaying a localized man page
instead of the default english one from /usr/share/man/man1/w3m.1.

Without a mandoc.db in the manpath, man(1) behaves predictably, and
removing from -a from the makewhatis(8) invocations makes it behave
predictably even with a mandoc.db available.

Users who wish to use localized man pages are expected to configure
manpaths in man.conf(5) or use the MANPATH env var.

Fixes #28146

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A patch file from https://github.com/void-linux/void-packages/pull/28252.patch is attached