While fixing RHEL-45465 I discovered a subtle problem in how 64 bit results are returned from some libguestfs calls. It is explained and fixed in this upstream commit:

https://github.com/libguestfs/libguestfs/commit/882ef4d93a2f8b150a66fa89f87ef1c4dd42de2f

Even though it is not known to affect anything in RHEL 9 or tools like virt-v2v, we ought to fix this in case it is causing silent failures.