If tagging fails for some reason, the error is logged, but the operation is never retried. The module build gets stuck in a cycle. The system notes that the component "is complete, but not tagged in the final and/or build tags." and cannot proceed.

While it is not normal for tagging operations to fail, it is certainly possible with various misconfigurations (e.g. bad koji policy, missing perms for the user running mbs). It seems reasonable to have some sort of retry or recovery mechanism here.