[Tumbleweed] Build failed for rubygem, but only for Tumbleweed

I’m trying to figure out why my rubygem package is failing for Tumbleweed, but building fine on Leap:

Building rubygem-other_video_transcoding.spec for openSUSE_Tumbleweed/x86_64
Getting buildconfig from server and store to /home/overlord/Development/OBS/home:tyrannishawk/rubygem-other_video_transcoding/.osc/_buildconfig-openSUSE_Tumbleweed-x86_64
Getting buildinfo from server and store to /home/overlord/Development/OBS/home:tyrannishawk/rubygem-other_video_transcoding/.osc/_buildinfo-openSUSE_Tumbleweed-x86_64.xml
buildinfo is broken... it says:
unresolvable: nothing provides rubygem(ruby:2.7.0:gem2rpm)

I’m having the exact same issue with a rubygem I already have on OBS: https://build.opensuse.org/package/show/home:tyrannishawk/rubygem-video_transcoding

I’m running the latest snapshot of Tumbleweed (2020-05-04) and the current ruby version is 2.6.6.
I’ve followed the Ruby packaging guide: https://en.opensuse.org/openSUSE:Packaging_Ruby

Hope someone can tell me why these builds are failing.

Hi
There are two ruby versions available in Tumbleweed, 2.6 and 2.7, but no 2.7 rubygems by the looks…

Try setiing your requires to <= 2.6


BuildRequires:  %{rubygem gem2rpm  <= 2.6}

I have the same issue. What us eto successfully build now failed.
I have nuspell package which I submit to factory, but it just failed recently.