Issue Summary

• In the Original color scheme, the Control Chart legend correctly shows the blue outlined line representing the Standard Deviation under “Predictability”.

• In both Light and Dark modes, the actual chart still renders the Standard Deviation correctly.

• The issue is only with the legend/preview: the blue outline for the Standard Deviation line does not appear in either Light/Dark mode.

So this looks like a visual theming bug in the legend only, not a problem with the Control Chart’s data or calculations.

This bug is present in any version with the Dark theme available.

Steps to Reproduce

1. Open a project page
2. Go to reports
3. Select the Control Chart
4. Note that the Predictability blue line is missing when using Light or Dark mode.

Expected Results

Predictability blue line shows when using Light and Dark mode.

Actual Results

The Predictability blue line in the Control Chart is not displayed in the Control Chart preview when Light or Dark mode is selected in Jira. 
This doesn't affect the data; it's just the preview. 

Workaround

No workaround found yet.