Dotted decorators on `TypedDict` classes fails for a certain package layout

Bug Report, To Reproduce, & Actual Behaviour

I'm hitting a strange error in data_structures.py with the following project structure, with a potential culprit in runtime_validation.py:

Project/
└── package/
    ├── __init__.py
    ├── data_structures.py
    └── runtime_validation.py

• Contents of data_structures.py

  import typing as tp
  import package.runtime_validation as _runtime_validation
  # from package.runtime_validation import register_runtime_validator  # Uncomment to make errors disappear
  
  deco = _runtime_validation.register_runtime_validator  # OK
  
  @_runtime_validation.register_runtime_validator  # OK
  class A: ...
  
  @_runtime_validation.register_runtime_validator  # E: Module has no attribute "register_runtime_validator"
  class TD(tp.TypedDict): ...
  

• Contents of __init__.py

  import typing as tp
  
  RUNTIME_VALIDATORS: tp.Final = ...
  
  from package.data_structures import TD
  

• Contents of runtime_validation.py

  import typing as tp
  
  from package import RUNTIME_VALIDATORS  # Comment out to make errors in `data_structures.py` disappear
  
  def register_runtime_validator(Type: type[tp.Any], /) -> type[tp.Any]:
      ...
      return Type
  

Expected Behavior

No issues

Your Environment

• Mypy version used: 1.11.1
• Mypy command-line flags: None
• Mypy configuration options from mypy.ini (and other config files): None
• Python version used: 3.10.11

使用 data_structures.py、init.py 和 runtime_validation.py 中所示的套件配置與內容，透過 mypy 1.11.1 重現此問題。先追蹤匯入循環如何影響 TypedDict 類別上點號 decorator 的屬性查找。不取消直接匯入的註解，且範例不再回報缺少屬性錯誤，即表示完成。