After talking to Danilo, I understand that this is a data migration issue rather than a bug.
He's provided me some data about the projects affected (~50) and a workaround to mark the empty messages as shared (by exporting Ubuntu translations and uploading them in the upstream project), so I'm happy with lowering the importance of the bug.
After talking to Danilo, I understand that this is a data migration issue rather than a bug.
He's provided me some data about the projects affected (~50) and a workaround to mark the empty messages as shared (by exporting Ubuntu translations and uploading them in the upstream project), so I'm happy with lowering the importance of the bug.