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[TSP] codeaction error #8029

@kinto0

Description

@kinto0

Environment data

  • Pylance trunk
  • Pyrefly 0.63.1
  • Type server set to Pyrefly

Repro Steps

  • unknown

## Environment data

- Pylance trunk
- Pyrefly 0.63.1
- Type server set to Pyrefly

## Code snippet

class Foo: ...
class Base(Foo): ...


## Repro Steps
- type hierarchy request on `Base`
- type hierararchy does not work (empty response)
- notice error message (maybe unrelated?)

2026-04-29 10:44:05.963 [trace] Received response 'typeHierarchy/subtypes - (1242)' in 5ms. Request failed: Request typeHierarchy/subtypes failed with message: Cannot read properties of undefined (reading 'decoratorDataClassBehaviors') (-32603).
2026-04-29 10:44:05.963 [error] Request typeHierarchy/subtypes failed.
Message: Request typeHierarchy/subtypes failed with message: Cannot read properties of undefined (reading 'decoratorDataClassBehaviors')
Code: -32603

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