Issues propagating the query context into a CALCULATE nested inside a RANKX function

Dear Team,

I am trying to create a Rank column (not measure) based on the total sales per customer in my dataset.

Rank column = 
RANKX(
    ALLSELECTED('Dataset'[Customer]), 
    CALCULATE(
        SUM('Dataset'[Sales]),
        FILTER(ALLSELECTED('Dataset'), 
        'Dataset'[Customer] = EARLIER('Dataset'[Customer])
        )
    ), ,
    DESC)

The formula worked fine until... I apply a query filter (say on the slicer on the material column).
I have tried to debug the formula quite a bit but I have the impression, that DAX cannot apply the ALLSELECTED query filter when the FILTER is nested inside the RANKX + CALCULATE functions.

What makes me think that is that the following formula works fine.

Sales by Customer = 
CALCULATE(
    SUM('Dataset'[Sales]),
    FILTER(ALLSELECTED('Dataset'),
    'Dataset'[Customer] = MAX('Dataset'[Customer])
    ) 
)

Thanks to all in advance!