[Python] Failed to display Glyphs (points) on Bokeh Google Map graph with valid API key and...

I am attempting to display points (glyphs) on a Bokeh Google Map graph using valid latitude and longitude data from a CSV file. Although the map renders correctly with the specified API key, the circles representing the data points do not appear on the map. I have verified the data types and ensured the map options are set to a relevant location, yet the points remain absent.

Below is what I tried:

from bokeh.models import ColumnDataSource, GMapOptions
from bokeh.plotting import gmap
from bokeh.io import output_file, show
import pandas as pd

output_file("gmap.html")

edu = pd.read_csv('adult_education.csv')
latitude = edu['Latitude']
longitude = edu['Longitude']

map_options = GMapOptions(lat=50.748165, lng=-122.595148, map_type="roadmap", zoom=5)

p = gmap("Valid API", map_options, title="Vancouver")
source = ColumnDataSource(
data=dict(lat=latitude.tolist(),
lon=longitude.tolist()))

p.circle(x="lon", y="lat", size=20, fill_color="blue", fill_alpha=0.8, source=source)

show(p)


Below is what I got:

enter image description here

This is what I was expecting: enter image description here

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