RLS does not working for multiple datasets

Dear Power BI Community, 

we have an issue with a row level security if we using multiple datasets for 1 report. We created 2 datasets - Test A and Test B with the same roles: Betriebsleiter and Unlimited. 
Betriebsleiter should only see the location "München IP"

This RLS works if we test the 2 datasets separately:

But if we combined the 2 datasets and uploaded it to Power BI Service, we can not see any data as "Betriebsleiter":

With my account I can see all values in the table:

Could you please help me what we do wrong? Is there any solution for this? 

Thank you!