Trigger Batching - Not working for Metadata Time?

Has anyone else noticed this? When I'm working on triggers it's useful to trigger-batch to test out that the trigger works. However, batching metadata time triggers seems to not work. If I leave it for 15mins then the trigger runs as works fine. It's just the batching that seems to not work.


UPDATE: I'm also noticing that if the metadata field being used has a time set by keyword replacement or an offset then the metadata time trigger is not firing. It is only firing if the field has an explicitly set datetime.