Fix free func cone dispatching

[adam-urbanczyk]

Solves #1830

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.86%. Comparing base (f3c5536) to head (d73dc54).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1969   +/-   ##
=======================================
  Coverage   95.86%   95.86%           
=======================================
  Files          29       29           
  Lines        7949     7954    +5     
  Branches     1194     1197    +3     
=======================================
+ Hits         7620     7625    +5     
  Misses        191      191           
  Partials      138      138           

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