Changing milestone from Eclipse results in task no longer shown in task view

[sroughley]

When adding a milestone to an issue in Eclipse, the milestone is correctly added to the gitlab repository issue, but the issue disappears from the Task view Task List query which should now contain it (I have 2 queries for repo - one for all open issues, and one for open issues with a particular milestone. I would expect that when assigning an issue without a milestone to the milestone it would move from one query to the other, however this does not appear to happen even after refresh or even restarting Eclipse)
Typing the issue number into the search box at the top of the Tasks list, however, shows it to be present in both queries

[sroughley]

Some further information on this. I tried refreshing each query, updating repository configuration, adding a new query, restarting eclipse, deleting all queries and adding a new query. None of these actions resolved the task list not showing the moved task, but it could be resolved by deleting the repository from the task repositories, and then re-adding it.