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For 2.32.x, filed <https://github.com/pantsbuild/pants/pull/23354|pants uv issue repro #23354>

Bug 1 - maybe more of a pex bug
Bug 2 - between Pants/pex. Didn't dig yet.

at least claude claims they are the same:
&gt; Both bugs share the same root cause: once PEX satisfies a package from a no-extras req_string, a subsequent req_string for the same package _with_ extras is treated as already resolved — the extras are never activated.

~tested with uv off:~
```+++ b/uv-extras-repro/pants.toml
@@ -6,7 +6,6 @@ backend_packages = ["pants.backend.python"]
 [python]
 interpreter_constraints = ["CPython>=3.10"]
 enable_resolves = true
-resolver = "uv"```
~it repros too, so probably more signal this is a pex issue.~

~given this, this is probably not pants release blocking.~

nvm without `uv` , they both work, so this is breaking existing behavior.

Resolved via <https://github.com/pantsbuild/pants/pull/23354#issuecomment-4467807264>, so may need a bump on pex and cherrypick to 2.32.x.

<https://github.com/pantsbuild/pants/pull/23355>

cherry-pick PR: <https://github.com/pantsbuild/pants/pull/23356> (someone else will need to approve since the auto cherry picker failed)