bug: Cannot disable tab buttons in flet 0.80.* / 0.81.0

[xkjq]

Duplicate Check

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

Describe the bug

Disabling a TabBar Tab in flet 0.81.0 does not work as expected.

Code sample

Code

import flet as ft

def main(page: ft.Page):
    page.title = "Flet Tabs disable test"

    # Create tabs
    test1 = ft.Tab(label="Test 1")
    test2 = ft.Tab(label="Test 2")
    test3 = ft.Tab(label="Test 3")

    tab_bar = ft.TabBar(tabs=[test1, test2, test3])
    tab_view = ft.TabBarView(
        controls=[
            ft.Column(controls=[ft.Text("Test 1 content")]),
            ft.Column(controls=[ft.Text("Test 2 content")]),
            ft.Column(controls=[ft.Text("Test 3 content")]),
        ],
        expand=True,
    )

    tabs_control = ft.Tabs(
        selected_index=0,
        length=3,
        expand=True,
        content=ft.Column(controls=[tab_bar, tab_view], expand=True),
    )

    def disable_direct(e):
        # direct reference to the Tab object
        test2.disabled = True
        page.update()

    def enable_direct(e):
        test2.disabled = False
        page.update()

    def relabel_direct(e):
        test3.label = "Test 3 (Relabeled)"
        page.update()

    def disable_lookup(e):
        # find the TabBar from tabs_control.content.controls[0]
        tb = tabs_control.content.controls[0]
        for t in getattr(tb, "tabs", []):
            if getattr(t, "label", None) == "Test 2":
                t.disabled = True
                break
        page.update()

    def enable_lookup(e):
        tb = tabs_control.content.controls[0]
        for t in getattr(tb, "tabs", []):
            if getattr(t, "label", None) == "Test 2":
                t.disabled = False
                break
        page.update()

    # Buttons to exercise both approaches
    btns = ft.Row(
        controls=[
            ft.Button("Disable (direct)", on_click=disable_direct),
            ft.Button("Enable (direct)", on_click=enable_direct),
            ft.Button("Disable (lookup)", on_click=disable_lookup),
            ft.Button("Enable (lookup)", on_click=enable_lookup),
            ft.Button("Relabel (direct)", on_click=relabel_direct),
        ]
    )

    page.add(ft.Column(controls=[tabs_control, btns], expand=True))


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

To reproduce

1. Run the repo code
2. Click the buttons at the bottom of the page

Expected behavior

• Expected behavior: tab bar button is disabled and enabled via buttons
• Actual behavior: tab bar button remains enabled

Screenshots / Videos

Captures

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Operating System

Linux

Operating system details

Ubuntu 25.10

Flet version

Flet 0.81.0

Regression

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

Suggestions

No response

Logs

Additional details

Similar code was working in the 0.28.x version