mbs-manager raises an exception if the module build fails. This should just print stderr and exit with a non-zero exit code. We've been getting bug reports about these at: https://bugzilla.redhat.com/show_bug.cgi?id=1730323
Please note that rpkg may need to be adjusted for this.
It would be good to fix this after migrating mbs-manager to a new CLI framework mentioned in FACTORY-4876.
Commit e5c51d9 fixes this issue
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