FIX: color not working properly for traces in single plot

[althaf-ansys]

Description

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Issue linked

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Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
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[maxcapodi78]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.07%. Comparing base (70850e5) to head (6aec722).
Report is 1 commits behind head on main.

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6020      +/-   ##
==========================================
+ Coverage   85.06%   85.07%   +0.01%     
==========================================
  Files         166      166              
  Lines       62980    62980              
==========================================
+ Hits        53572    53579       +7     
+ Misses       9408     9401       -7     

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