Fix use of extensions in $graph

[mr-c]

Fixes #2114

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.97%. Comparing base (011c3dd) to head (b6429c4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2181      +/-   ##
==========================================
- Coverage   85.11%   84.97%   -0.14%     
==========================================
  Files          46       46              
  Lines        8405     8408       +3     
  Branches     1967     1967              
==========================================
- Hits         7154     7145       -9     
- Misses        784      794      +10     
- Partials      467      469       +2     

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