px.timeline hoverdata not working as intended

[Sliskorm]

then i run this code below i get:
ValueError: Value of 'hover_data_1' is not the name of a column in 'data_frame'. Expected one of ['start_x', 'end_y', 'Hoverdata', 'H', 'y'] but received: o

#pip install plotly
#pip install pandas
#pip install xlrd

import plotly.express as px
import pandas as pd
df=pd.read_excel('bug.xls')
print(df)

fig=px.timeline
(data_frame=df,
x_start='start_x',
x_end='end_y',
y='y',
hover_data='Hoverdata',
#hover_data='H',
)
fig.show()

but if i run this code it work.

#pip install plotly
#pip install pandas
#pip install xlrd

import plotly.express as px
import pandas as pd
df=pd.read_excel('bug.xls')
print(df)

fig=px.timeline
(data_frame=df,
x_start='start_x',
x_end='end_y',
y='y',
#hover_data='Hoverdata',
hover_data='H',
)
fig.show()

custom_data behaves the same way.

this is the df data i used
start_x end_y Hoverdata H y
0 2021-03-05 2020-05-16 00:00:00 text1 text1 name1
1 2021-03-06 2009-06-04 15:45:00 text2 text2 name2
2 2021-03-07 2009-06-04 15:45:00 text3 text3 name3
3 2021-03-08 2020-05-04 00:00:00 text4 text4 name4
4 2021-03-09 2020-05-06 00:00:00 text5 text5 name5
5 2021-03-10 2020-05-07 00:00:00 text6 text6 name6
6 2021-03-11 2020-05-07 00:00:00 text7 text7 name7
7 2021-03-12 2020-05-06 00:00:00 text8 text8 name8
8 2021-03-13 2019-05-13 00:00:00 text9 text9 name9
9 2021-03-14 2018-06-18 00:00:00 text10 text10 name10

[nicolaskruchten]

Yes, hover_data accepts a list or a dict, not a string. We need a better error message for this :(

In fact we have an issue open to improve the error messages here: #2177

[Sliskorm]

Darn i through it was bug. Closeing this One.
Idea
px.timeline(overwrite_hoverdata=columb in dataframe)
px.timeline(append_hoverdata=columb in dataframe)