Community moderators have prevented the ability to post new answers.
Provided that Done is the final status in that workflow, I'd say the most likely cause is that said status has the property jira.issue.editable=false in order to prevent already closed issues from being edited, which also affects transitioning capability.
Should you want to get rid off of that property, you may:
What conditions do you have on the "all" transitions into the first three status?
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