Software versions

Python version : 3.10.13 (main, Sep 11 2023, 13:44:35) [GCC 11.2.0]
IPython version : 8.18.1
Tornado version : 6.3.3
Bokeh version : 3.4.0
BokehJS static path : .../anaconda3/envs/tiatoolbox-latest/lib/python3.10/site-packages/bokeh/server/static
node.js version : (not installed)
npm version : (not installed)
jupyter_bokeh version : (not installed)
Operating system : Linux-6.5.0-15-generic-x86_64-with-glibc2.38

Browser name and version

No response

Jupyter notebook / Jupyter Lab version

No response

Expected behavior

Code that previously worked with bokeh 3.3 does not work with 3.4. Expect drop-down menu to change when we change the .menu attribute (i.e when button clicked in example below) but it is not updated.

probably related to #13755

Observed behavior

drop-down menu doesn't change

Example code

from bokeh.io import curdoc
from bokeh.models import Dropdown, Column, Button

d = Dropdown(label="foo", menu=["foo", "bar"])
b = Button(label="Button")

def change_menu(event):
    print("changing menu")
    d.menu = ["foo", "bar", "baz"]

b.on_click(change_menu)

column = Column(children=[d, b])

curdoc().add_root(column)

Stack traceback or browser console output

No response

Screenshots

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