"'"Upstream [#Linux #kernel] deprecated the V4 format for #XFS with commit b96cb835[1]. […] #Fedora 40 will be the last release that supports these older XFS filesystems."'"
That's a quote from this short blog post from Fedora's #LinuxKernel maintainer Justin M. Forbes: https://jforbes.livejournal.com/16835.html
[1] https://git.kernel.org/linus/b96cb835 (from September 2020)