Hi, the slicer causes the same problem. If I use a filter on the pivot or on the pivot chart and just select one name, it reverts my chart to a bar chart (actually a "clustered column" chart.
Long time follower. Love your stuff!
Created a simple pivot chart with 5 series names, YRMO on X axis and percent in values. I used a Combo chart type. If I apply a filter that selects one of the 5 series names, I get a lame bar chart. If I select all 5 names, I'm stuck with the bar chart...