#4996
When BE is restarting and the older tablet have been added to the garbage collection queue but not deleted yet.
In this case, since the data_dirs are parallel loaded, a later loaded tablet may be older than previously loaded one, which should not be acknowledged as a failure.
It should be noted that the _add_tablet_unlocked() method will also be called when creating a new tablet. In that case, the changes in this pull request will not be accessed so there is no affect on the tablet creating process.
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