Prevent policy includes duplication in advanced routing configuration

[shaun-nx]

Cherry-pick of #3799

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.95%. Comparing base (0925904) to head (8b296e5).
⚠️ Report is 1 commits behind head on release-2.1.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-2.1    #3819      +/-   ##
===============================================
+ Coverage        86.93%   86.95%   +0.01%     
===============================================
  Files              128      128              
  Lines            16001    16001              
  Branches            62       62              
===============================================
+ Hits             13911    13913       +2     
+ Misses            1922     1921       -1     
+ Partials           168      167       -1     

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