`STOP TASK GROUP ALL` unexprected output

[Denchick]

Situation:

1. I have 5 RUNNING and 8 ERROR tasks in SHOW task_group
2. I call STOP TASK GROUP ALL

Expected: stop exactly 5 tasks
Actual: "stop" 13 tasks

spqr-console-> ;
          Move task group ID          
--------------------------------------
 1802ca4a-b2f8-45e0-9424-9d25e3597198
 9bf7ca23-92d6-48c3-aef8-fef27ee56882
 c7bc09cd-b379-46a8-8447-76af138289aa
 a319bf01-a0c1-4a78-9959-180f71bf8f3b
 62bce61a-0748-41ff-a618-93afaa02e23a
 b528fb8f-2487-4ba6-b216-cab01be03518
 07fd3061-514d-4383-aea7-13ceed89bd1d
 61afe009-29cc-450f-96aa-92831169ff47
 7f031b4e-df8e-4aa9-b5a3-1f56ef0e0bab
 90c9cd16-6957-4926-9665-bb6beecb4f89
 d3a963bd-402f-4bc5-af82-1b8768ec37eb
 d24feba2-6fa1-4cef-9c58-6823a1b53ea7
 ec364af7-0e06-4c68-b907-ac8e1423615d
(13 rows)