Hi, I am trying to use the library for a simple visualisation for the first time, and I stumbled upon supposedly a bug trying to draw a vertical line with text annotation on a graph with a date-time x axis.

import plotly.express as px
df = px.data.stocks(indexed=True)
fig = px.line(df)
fig.add_vline(x="2018-09-24", annotation_text="test" )
fig.show()

I get the following error message:

TypeError: unsupported operand type(s) for +: 'int' and 'str'

Could anyone please help me confirm that it is indeed a bug, my version is '4.14.1' ? Thank you.