Fixes #1600

[smaddock]

I don't know if this is considered a breaking change or not, but it fixes an issue I raised.

Fixes: #1600

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.49%. Comparing base (691c0d4) to head (e22a523).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1603      +/-   ##
============================================
+ Coverage     69.33%   69.49%   +0.16%     
  Complexity     2805     2805              
============================================
  Files           414      414              
  Lines          8585     8585              
============================================
+ Hits           5952     5966      +14     
+ Misses         2633     2619      -14     

Flag	Coverage Δ
8.1	69.11% <ø> (+0.05%)	⬆️
8.2	69.29% <ø> (+<0.01%)	⬆️
8.3	69.38% <ø> (+0.11%)	⬆️
8.4	69.24% <ø> (?)

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Files with missing lines	Coverage Δ
src/Contrib/Otlp/OtlpHttpTransportFactory.php	80.00% <ø> (ø)
src/SDK/Common/Export/Http/PsrTransportFactory.php	78.57% <ø> (ø)

... and 6 files with indirect coverage changes

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