Relative date icw Timeline slicer 2.4.0. not working as expected

I use the Timeline slicer in a report.

In the linked visual, the last date I see is 2022-05-28

Now I add a relative date selection on the Timeline visual

My Timeline slicer is showing W5 - W20

If I select W19, the max date is 2022-05-15

If I select W5-W19, the max Date stays the same.

When I change it to from W5 to W20, the highest dat is not the expected 2022-05-21, but 2022-12-30.

Why is this? And how can I change it, so it is always looking only to the last 15 calendar weeks?