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 85.12%. Comparing base (250e684) to head (537b8db).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2181   +/-   ##
=======================================
  Coverage   85.12%   85.12%           
=======================================
  Files          46       46           
  Lines        8368     8371    +3     
  Branches     1956     1956           
=======================================
+ Hits         7123     7126    +3     
  Misses        779      779           
  Partials      466      466           

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