Upgrading from F37 (desktop flavors) to F39 currently fails because of a problem with the CJK fonts. Rawhide has both:

google-noto-sans-cjk-fonts-2.004-2.fc39.noarch.rpm (from google-noto-sans-cjk-fonts src rpm)
google-noto-sans-cjk-vf-fonts-2.004-1.fc38.noarch.rpm (from google-noto-sans-cjk-vf-fonts src rpm)

Both of these obsolete google-noto-cjk-fonts-common < 20201206-8 , which is in F37, so dnf wants to install both of them on upgrade. But they conflict with each other, so dnf doesn't know what to do, and fails.

These are the errors:

dnf.exceptions.DepsolveError: 
 Problem: both package google-noto-sans-cjk-vf-fonts-1:2.004-1.fc38.noarch and google-noto-sans-cjk-fonts-1:2.004-2.fc39.noarch obsolete google-noto-cjk-fonts-common < 20201206-8
  - package google-noto-sans-cjk-fonts-1:2.004-2.fc39.noarch conflicts with google-noto-sans-cjk-vf-fonts provided by google-noto-sans-cjk-vf-fonts-1:2.004-1.fc38.noarch
  - package google-noto-sans-cjk-vf-fonts-1:2.004-1.fc38.noarch conflicts with google-noto-sans-cjk-fonts provided by google-noto-sans-cjk-fonts-1:2.004-2.fc39.noarch
  - conflicting requests
2023-03-23T11:54:21-0400 CRITICAL Error: 
 Problem: both package google-noto-sans-cjk-vf-fonts-1:2.004-1.fc38.noarch and google-noto-sans-cjk-fonts-1:2.004-2.fc39.noarch obsolete google-noto-cjk-fonts-common < 20201206-8
  - package google-noto-sans-cjk-fonts-1:2.004-2.fc39.noarch conflicts with google-noto-sans-cjk-vf-fonts provided by google-noto-sans-cjk-vf-fonts-1:2.004-1.fc38.noarch
  - package google-noto-sans-cjk-vf-fonts-1:2.004-1.fc38.noarch conflicts with google-noto-sans-cjk-fonts provided by google-noto-sans-cjk-fonts-1:2.004-2.fc39.noarch
  - conflicting requests

Probably only *one* of them - the "preferred" default one - should have the obsoletes, if they're meant to be alternatives to each other.