Ensure model changes are applied while session is starting

[philippjfr]

Fixes #6709

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.50%. Comparing base (c7af196) to head (0a7970e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6835      +/-   ##
==========================================
- Coverage   81.51%   81.50%   -0.01%     
==========================================
  Files         318      318              
  Lines       46709    46709              
==========================================
- Hits        38074    38070       -4     
- Misses       8635     8639       +4     

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