Can't add local attribute for namespaced theorem

Prerequisites

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• Check that your issue is not already filed:
  https://github.com/leanprover/lean4/issues
• Reduce the issue to a minimal, self-contained, reproducible test case.
  Avoid dependencies to Mathlib or Batteries.
• Test your test case against the latest nightly release, for example on
  https://live.lean-lang.org/#project=lean-nightly
  (You can also use the settings there to switch to “Lean nightly”)

Description

The construction

@[local ...]
theorem Foo.bar ...

seemingly makes the attribute local to the Foo namespace, which is immediately closed again. Hence the attribute is effectively not applied.

Steps to Reproduce

MWE:

-- Fails

@[local simp]
axiom Foo.falso : False

example : False := by simp -- simp made no progress

-- Works

@[local simp]
axiom falso : False

example : False := by simp

I don't see a situation in which this behaviour would be useful, so the first example should imo either make the attribute local to the current section/namespace or throw an error at @[local simp]. There is probably a similar issue with scoped attributes; there the desired behaviour is less clear.

Versions

"4.11.0-nightly-2024-07-12"

Impact

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No source file or test is named. Start by running the two minimal Lean examples against the reported nightly behavior, then trace how @[local simp] is handled for namespaced declarations; done means the behavior is either corrected to keep the attribute local or rejected with a clear error.