Any parameter containing a JSON schema will be confused by Block loading

[indigoviolet]

Bug summary

from typing import Any

from prefect import flow
from pydantic import BaseModel


class Foo(BaseModel):
    a: int
    b: str


class Bar(BaseModel):
    c: Foo


class Baz(BaseModel):
    jsonschema: dict[str, Any]


@flow
def my_flow(b: Baz):
    pass


if __name__ == "__main__":
    b2 = Baz(jsonschema=Bar.model_json_schema())
    my_flow(b=b2)

This will fail because of

prefect/src/prefect/flows.py

Line 537 in cd4994c

if isinstance(data, dict) and "$ref" in data:

It seems to me that this block loading code is casting too wide a net with $ref? or not encoding blocks in a specific-enough way?

Version info (prefect version output)

❯ prefect version                                      
Version:             3.0.10
API version:         0.8.4
Python version:      3.11.9
Git commit:          3aa2d893
Built:               Tue, Oct 15, 2024 1:31 PM
OS/Arch:             darwin/arm64
Profile:             ephemeral
Server type:         ephemeral
Pydantic version:    2.9.1
Server:
  Database:          sqlite
  SQLite version:    3.46.0
Integrations:
  prefect-gcp:       0.6.1

Additional context

No response