Instantiating a nested model with dict raises TypeError

[dvnatanael]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

When upgrading from pydantic 2.4.2 to 2.5.1, model fields of type BaseModel | Literal[True] or BaseModel | Literal[False] can no longer be instantiated using a model dict.

Traceback (most recent call last):
  File ".../test.py", line 10, in <module>
    Bar(foo={"x": 42})
  File ".../.pyenv/versions/test-pydantic25/lib/python3.11/site-packages/pydantic/main.py", line 164, in __init__
    __pydantic_self__.__pydantic_validator__.validate_python(data, self_instance=__pydantic_self__)
TypeError: unhashable type: 'dict'

Example Code

from pydantic import BaseModel
from typing import Literal

class Foo(BaseModel):
    x: int

class Bar(BaseModel):
    foo: Foo | Literal[True]

Bar(foo={"x": 42})  # TypeError: unhashable type: 'dict'

Python, Pydantic & OS Version

pydantic version: 2.5.1
        pydantic-core version: 2.14.3
          pydantic-core build: profile=release pgo=true
                 install path: .../.pyenv/versions/3.11.6/envs/test-pydantic25/lib/python3.11/site-packages/pydantic
               python version: 3.11.6 (main, Nov 21 2023, 10:15:54) [Clang 14.0.3 (clang-1403.0.22.14.1)]
                     platform: macOS-14.1.1-arm64-arm-64bit
             related packages: typing_extensions-4.8.0

[sydney-runkle]

Hi @dvnatanael,

This does look like a bug introduced by our most recent minor release. Thanks for reporting this. We'll look into a fix to get out with our next patch release.