Welcome to the community.
Are you able to view the workflow ? There are some reason that you can't transition an issue to a particular state, you're not in the group, project role, that are able to make the transition (workflow condition) or there is no transition to the previous state.
Look at your workflow to see if this transition is already here, if not you will need to create this transition that goes from tagging to the state you want.
Hope this helps
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