Thanks for the feedback. Currently you can’t force it to block completing when you tap the complete button. I’ll keep your feedback on the list to consider. Thanks!
Thanks for the feedback. Since complete button runs to complete the task, default action completes all subtasks along the way. It's not normal to block the action that the user intends to do.
I have plans to improve subtasks later on. I'll look into it when I get on it. Thanks!