Unexpected `ERROR: move task stopped by STOP MOVE TASK_GROUP command` when RETRY TASK GROUP

[Denchick]

Problem::

spqr-console=> retry task group '066ccaa3-9c32-4978-b134-d2489253bdde';
ERROR:  move task stopped by STOP MOVE TASK GROUP command

Expected behabioural: stop task group command should be idempotent, so you should have an ability to retry it.

[EinKrebs]

Expected behaviour

[Denchick]

            task_group_id             | destination_shard_id |                source_key_range_id                 |       destination_key_range_id       | batch_size |             move_task_id             | state |                                                                               error                                                                               |     created_at      |     updated_at      
--------------------------------------+----------------------+----------------------------------------------------+--------------------------------------+------------+--------------------------------------+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------+---------------------
 c7bc09cd-b379-46a8-8447-76af138289aa | shard-006            | ds_user_id_kr_ac7f57ce_246d_48cb_86d2_8d63f5d5846c | 8c6ceefa-1a5b-41ea-9b43-c01724988cb5 | 300000     | bf98a048-cca9-4413-9f98-6b2b38889c53 | ERROR | etcdserver: request timed out 

spqr-console=> retry task group 'c7bc09cd-b379-46a8-8447-76af138289aa';
ERROR:  move task stopped by STOP MOVE TASK GROUP command

So what? What should i do next? I want to proceed