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Sub-tasks are not items that go into a sprint. Of course, they do really, but only because they are part of their parent issue, which can be in a sprint.
The only way to get your sub-task into a sprint is to re-open the parent and bring that into the sprint. Or move the sub-task so that it is part of a different issue that is going into the sprint.
I'd also take a look at your process, to prevent you landing in this logically nonsensical place. You have broken data when you say "issue done, but sub-task not" - the sub-task is part of the parent, so how can the parent be done when part of it is not?
Project managers know this problem: A “mountain of work” lays in front of you, and you don’t know how and where to tackle them. Different to-dos lie ahead, but just one task after the other can be ha...
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