Not quite. The assignee is not "invalid" at all. If you remove the user and they have assigned issues in the project, it will NOT cause any technical problems. All that happens is that if you try to change the assignee, you will not be offered that user any more. It may cause a minor process problem - for unresolved issues, you probably want to reassign them to other users who will continue to work on the project. So it's worth looking at the list of *open* issues they are assigned to when you remove them from the project.
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