[release/6.0-staging] Fix neutral cultures created with the underscore #87415
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Backport of #87411 to release/6.0-staging
/cc @tarekgh
Customer Impact
This is a delta change to the original fix we did in #87177
Testing
Ran regression tests and added more test cases.
Risk
Low as we are not changing any logic other than ensuring compatibility.
IMPORTANT: If this backport is for a servicing release, please verify that:
The PR target branch is
release/X.0-staging
, notrelease/X.0
.If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.