bug: V1: Slider on_change data is None

[3mora2]

Duplicate Check

• I have searched the opened issues and there are no duplicates

Describe the bug

Slider on_change event data is None

Code sample

Code

import flet as ft


def main(page: ft.Page):
    page.add(
        ft.Slider(label="Slider", value=0.3, on_change=lambda e: print("Slider changed!", e.data)),
    )


if __name__ == "__main__":
    ft.run(main)

To reproduce

run code

Expected behavior

return value

Screenshots / Videos

Captures

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Operating System

Windows

Operating system details

11

Flet version

0.70.0.dev6696

Regression

No, it isn't

Suggestions

No response

Logs

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Additional details

No response