With the newest version of Power BI, you need to drill down to the lowest level and sort by the hierarchy. Also ensure the concatenate lebels is off. Only with this sort does the hierachy not break (with my tests). Hope that helps.
I do still consider this a bug, but that is the only way I've managed to get around it.
Hi guys. A key requirement for this to work, is the correct sorting of your date table and data. This functionality does not work if your date data is not sorted sequentially. Once the data is sorted appropriately, then recreate the chart, starting with your date hierarchy (x-axis) then your values and finally switch 'Concatenate labels' to off. This will show the data as required.
I managed to get this to work yesterday, then again today same issue. Unitll i remembered that the table had to be sorted by Year, Month, then the labells finally did show up with year only once then all the months above.
I am using year and month in the auto hierarchy.
But it is buggy as you don`t get the expected result by just turining off the button concatenate labels on X-axis settings.