Missing the whole Fedora timeline. I was emailed by "Jia Tan" between Feb 27 and Mar 27, in a partially successful attempt to get the new xz into Fedora 40 & 41. Edit: I emailed Russ with the details.
https://lists.fedoraproject.org/archives/list/devel@lists.fe... (https://archive.ph/diGNB)
This is the rough sequence of events in Fedora:
https://lists.fedoraproject.org/archives/list/devel@lists.fe... (https://archive.ph/e0SdX)