SnackBar Fail

[joeg-ita]

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Describe the bug

Pyhton 3.9
Flet 0.23.1

Executing the snackbar control example now return the error:

File "/home/[omissis]/venv/lib64/python3.9/site-packages/flet_core/snack_bar.py", line 132, in before_update
if isinstance(self.__margin, Union[int, float, Padding]) and not self.width:
File "/usr/lib64/python3.9/typing.py", line 720, in instancecheck
return self.subclasscheck(type(obj))
File "/usr/lib64/python3.9/typing.py", line 723, in subclasscheck
raise TypeError("Subscripted generics cannot be used with"
TypeError: Subscripted generics cannot be used with class and instance checks

Setting margin (as int or float or Padding) or witdh doesn't change the result

Code

import flet as ft

class Data:
def init(self) -> None:
self.counter = 0

d = Data()

def main(page):

page.snack_bar = ft.SnackBar(
    content=ft.Text("Hello, world!"),
    action="Alright!",
)

def on_click(e):
    page.snack_bar = ft.SnackBar(ft.Text(f"Hello {d.counter}"))
    page.snack_bar.open = True
    d.counter += 1
    page.update()

page.add(ft.ElevatedButton("Open SnackBar", on_click=on_click))

ft.app(target=main)

To reproduce

run https://flet.dev/docs/controls/snackbar

Expected behavior

No response

Screenshots

No response

Operating System

Linux

Operating system details

RHEL8

Flet version

0.23.1

Regression

Yes, it used to work in a previous Flet version (please specify the version in additional details)

Suggestions

No response

Additional details

No response