Thanks Will, I wasn't aware that dnf did things that way. I'm only encountering these situations now because I've only just started using the check-upgrade command with dnf.And, just for the record because I still had the Vagrant box running:
[vagrant@localhost ~]$ id
uid=1000(vagrant) gid=1000(vagrant) groups=1000(vagrant) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
[vagrant@localhost ~]$ dnf check-upgrade > /dev/null 2>&1
[vagrant@localhost ~]$ find . -mmin -1
.
./.local/state/dnf5.log
./.cache
./.cache/libdnf5