Looks like we can't reproduce the issue or there's a problem in the test case provided.
Bar Series is covered by Area Series
For some reason no matter what, bar series is behind area series.
Bar should be over area, but it's not. Only happens to the bar series. I tried scatter and line, they are just fine.
Also if I do
everything works fine I have bar on top of line and line on top of area.
but when it's just area and bar series, area always ends up on top for some reason