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The JavaSourcetaskFactory does not behave as expected, it does not unregister tasks when the file is closed. It is apparent from the issue #85216 that while the project was deleted there were active tasks for JavaSources which were deleting, but the delete project action closes the files prior deleting.
org.netbeans.editor.Registry does not fire very useful events in case the last editor pane is closed - I will improve the Registry to fire better events in this case.
Obsolete milestone, please reevaluate
Same root cause as issue #100753, IMO. *** This issue has been marked as a duplicate of 100753 ***