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Chart axis not scaling correctly with hidden series

Our application captures data and adds a line series to a chart. The chart contains a legend and ToggleSeriesVisibility = TRUE.

The SecondaryAxis does not set Minimum or Maximum - so the y-axis will automatically scale based on all visible series data.

When the application adds a second series, it hides the first series by setting its Visibility property to Hidden.

In version 18.2.0.55, the legend item for Series 1 would now look disabled and the y-axis would be scaled based on the values of Series 2 (because Series 1 is hidden)

As of version 18.2.0.56, this behavior has changed. After adding Series 2, both legened items look normal / enabled suggesting both series are visible (yet Series 1 is correctly hidden). Also, the y-axis is scaled based on the data for Series 1 and Series 2 but it should not be considering Series 1.

I have tested the latest weekly and this problem still exists.