[BUG] Layout Hooks interfere with Persistence

[Aaron-Wrote-This]

Context
Python 3.13.5

dash                 3.1.1

Bug

When a layout hook is enabled, persistence doesn't function. The values are saved to the browser, but they're not used upon refresh.

Expected behavior

Upon reloading the page the input value is persisted, so it has the same value as before reloading.

Screenshots

from dash import hooks, dcc, html, callback, Input, Output, Dash

app = Dash()

app.layout = html.Div([
    dcc.Input(
        id='input-number',
        persistence=True, persistence_type='local'
    ),
    html.Div(id='output-div')
])

@callback(
    Output('output-div', 'children'),
    Input('input-number', 'value')
)
def update_output(value):
    return f'The input is {value}'

# Comment out to "fix" persistence
@hooks.layout()
def update_layout(layout):
    return [html.Div("New layout content"), layout]
# Comment out to "fix" persistence

if __name__ == '__main__':
    app.run(debug=True)

[T4rk1n]

This is unrelated to the layout hook, the real cause of the failure to apply persistence is layout as list.

if you replace:

@hooks.layout()
def update_layout(layout):
    return html.Div([html.Div("New layout content"), layout])

the persistence is applied.