Simple bidirectional filtering between bar chart and matrix not working!

Ok see if this works for you. Duplicate the single table and set up th emodel as follows.

Duplicate this table

Now create two measure to act as filters for each corresponding table:

Filter Person T1 =
COUNTROWS (
    CALCULATETABLE (
        VALUES ( 'Dim ID'[dID] ),
        FILTER ( 'Table 2', SUM ( 'Table 2'[Wert] ) <> 0 )
    )
)

Filter Person T2 =
COUNTROWS (
    CALCULATETABLE (
        VALUES ( 'Dim ID'[dID] ),
        FILTER ( 'Table 1', SUM ( 'Table 1'[Wert] ) <> 0 )
    )
)

Add the ID column from the ID dimenion table and set up each filter with its corresponding measure in the filter pane

and this is the final result

Sure, you can download it from here:

https://1drv.ms/u/s!AhGKDZz6e4HehLh5YX_pYCRVmymY3A?e=0vhNxM