Finally it's resolved by my own. I used the following SQL to re-trigger execution of the task group:
| -- delete already expanded sub-tasks from the queue (here the IDs of sub-tasks are specified) |
delete from mxp_provision where MSKey = @MSKey and AuditRef = @AuditID and ActionID in (1002143, 1002148, 1002153, 1002137)
-- re-run the task group again (set it as ready-to-run) (here the ID of the task group is specified)
update mxp_provision set State = 2 where MSKey = @MSKey and AuditRef = @AuditID and ActionID = 1002136
