Fix propagation error on invalid headers

[marcotc]

What does this PR do?

Motivation:

Change log entry

Additional Notes:

How to test the change?

[github-actions[bot]]

:wave: Hey @marcotc, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

None.

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^{Visited at: 2025-03-03 23:25:46 UTC}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.69%. Comparing base (b2274aa) to head (3f2bf87). Report is 25 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4451      +/-   ##
==========================================
- Coverage   97.71%   97.69%   -0.03%     
==========================================
  Files        1374     1374              
  Lines       83716    83813      +97     
  Branches     4236     4250      +14     
==========================================
+ Hits        81805    81879      +74     
- Misses       1911     1934      +23     

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[datadog-datadog-prod-us1[bot]]

Datadog Report

Branch report: fix-prop Commit report: 3f2bf87 Test service: dd-trace-rb

:white_check_mark: 0 Failed, 20611 Passed, 1370 Skipped, 3m 12.5s Total Time