I'm not entirely sure why, but it seems that it's only sometimes when creating a new GitHub repo that GitHub will add me as a watcher. So for this package I apparently weren't - and therefore missed all the reported issues and PRs 😫
I don't think Umbraco 12 has any changes that affect this package, so it supporting Umbraco 12 should hopefully just be a matter of bumping the dependency version and pushing a new release. I will try getting around that today.
And then hopefully also some time to look into the issues and PRs.