When attempting a Granular Item Level Restore, it fails with a "Rollback is pending" error.
The latest backup was aborted abruptly leaving a pending rollback or else the rollback is failing. Hence the Granular Restore fails with this error on the current backup set since it's in an inconsistent state.
In order to resolve this, you can start a manual backup ('Take Backup' screen) or restore clone ('Restore' screen) and then abort it once the Reverting/Rollback is done. You'll notice it's done because it will start transferring the changes. Once you abort it gracefully and let it complete successfully you'll be able to perform the granular restore since there will be no rollback pending.