When 11.0.0-alpha1 was released, the 11.0.x-dev release did not exist yet, since it did not need to be branched yet. The subtree splitter was assuming the dev branch would always have all three components.
A temporary fix was made: https://bitbucket.org/drupalorg-infrastructure/subtree-splitter/commits/... which is already wrong, since 11.0.x-dev now exists. Another temporary fix would be reverting that commit, we’d be good until 11.1.0-alpha1.
And in the future, we want to use the main branch as the last fallback to support
🌱
Use a 'main' branch as the development target
Active
{major}.{minor}.x first{major}.xmainCommandBase::getCoreBranch()Fixed
Packaging
This is now fixed: https://bitbucket.org/drupalorg-infrastructure/subtree-splitter/commits/...
So 11.0.0-alpha2 should complete as-expected with the 11.0.x branch.
Automatically closed - issue fixed for 2 weeks with no activity.