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In RHEL 8.6 and 9.0, less commonly used gconv modules have been split out into a separate glibc-gconv-extra package, to which glibc has only a weak dependency (bug 2015768) meaning that cannot be assumed to be present, particularly in containers.

However, mtools used codepage 850 by default, which is among the codesets that were split out:

https://www.gnu.org/software/mtools/manual/mtools.html#miscellaneous-variables

OCP ironic-image uses mtools in a container:

https://github.com/openshift/ironic-image/blob/master/prepare-efi.sh

Since OCP 4.11 just switched to building off of 8.6 Beta, this has caused a regression in building this image:

 + mmd -i /tmp/esp.img EFI
Error converting to codepage 850 Invalid argument
Cannot initialize '::' 

https://prow.ci.openshift.org/view/gs/origin-ci-test/pr-logs/pull/openshift_ironic-image/263/pull-ci-openshift-ironic-image-master-images/1513233658540986368

Fedora mtools now makes this dependency explicit so that mtools works out of the box:

https://src.fedoraproject.org/rpms/mtools/blob/rawhide/f/mtools.spec#_14

RHEL mtools now needs to do the same.