fix: __typename do not work at root level

[ssddOnTop]

Issue Reference(s):
Fixes #2836

[codecov]

Codecov Report

Attention: Patch coverage is 96.15385% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.15%. Comparing base (69f291e) to head (03de0bb).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core/jit/synth/synth.rs	94.44%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2840   +/-   ##
=======================================
  Coverage   87.14%   87.15%           
=======================================
  Files         253      253           
  Lines       25564    25585   +21     
=======================================
+ Hits        22279    22299   +20     
- Misses       3285     3286    +1     

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