Power Query "append" returns incorrect data

Hi,

people already reported that appending (and probably also merging) tables via Power Query returns incorrect results. Last week I showed how to simulate this bug using test data: https://community.powerbi.com/t5/Desktop/Each-data-refresh-gives-different-data-results/m-p/314878#M139803

However, noone seems to notice the post in an old thread. Can you please look into it?

Thanks,

Petr