Two solutions were proposed on
https://bugs.eclipse.org/bugs/show_bug.cgi?id=343688#c10
1: Disable Sync Automatically in the task list view menu.

2: close the "Task List" view so that it does not appear at startup, and in the "Settings"> "General"> "Start and Shutdown" section, disable the Mylyn Team UI user interface and Mylyn Tasks user interface
The first decision was reported as working.
Jeremy S.
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