Avoid using extended field designator for offsetof

[xiazhvera]

Issue #, if available:

Description of changes:

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[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 83.12%. Comparing base (06cf4d8) to head (56fc326). :warning: Report is 72 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1120   +/-   ##
=======================================
  Coverage   83.12%   83.12%           
=======================================
  Files          56       56           
  Lines        5755     5755           
=======================================
  Hits         4784     4784           
  Misses        971      971           

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