Add TAttMarker_3 support

[tamasgal]

Fixes #375

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.91%. Comparing base (e0bbe77) to head (e1e589d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #376   +/-   ##
=======================================
  Coverage   83.91%   83.91%           
=======================================
  Files          21       21           
  Lines        3084     3084           
=======================================
  Hits         2588     2588           
  Misses        496      496           

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