JupyterDash line shapes incorrect plotted

Plotting lines in Plotly and JupyterDash gives a problem. I don't know if the issue is related to Plotly or JupyterDash, depending on which is the expected behaviour.

It did work in a previous version of Plotly.

Versions:

dash==1.17.0
jupyter-dash==0.3.1
plotly==4.12.0

import plotly.graph_objects as go
from dash.dependencies import Input, Output
from jupyter_dash import JupyterDash

from dash.dependencies import Input, Output
import dash_core_components as dcc
import dash_html_components as html
import dash_table

x_data = [ 54135, 12346, 75492, 64135, 748612, 31548 ]

fig = go.Figure(go.Scatter(x=x_data, y=[1, 2, 3, 4, 5, 6]))
fig.update_xaxes(
        title_text='Segments',
        type='category'
)
fig.add_shape(
      dict(
        type="line",
        xref='x', yref='y',
        x0=x_data[4], x1=x_data[4],
        y0=0, y1=10,
      )
)
fig.show()

app = JupyterDash(__name__)

app.layout = html.Div([
    dcc.Graph(figure=fig)
])

app.run_server(host='0.0.0.0', port=8003)

But apparently, this gives different results in Plotly as it does in Dash.

Plotly

Dash

(The small part on the left is the zoomed-out result, because the vertical-line was plotted at 31548 (which is the class of the X_data, but Dash seems to regard is as an integer)
This only happened in the latest updates (I used to work with plotly=4.8.0 before this error)

Start with the supplied Python reproduction and compare fig.show() with the JupyterDash app.run_server() output using the listed Plotly, Dash, and JupyterDash versions. Trace how the categorical x-axis value is interpreted for the added shape, then determine whether the discrepancy belongs to Plotly or JupyterDash. Done means the vertical line aligns with the intended category in both outputs.