Rangeslider two ways

📊 Plotly Python
1

to my understanding the following two lines of code should do the exact same thing:

    fig['layout']['xaxis4']=dict(
        rangeslider=dict(
            autorange=True,
            thickness=0.05,
            borderwidth=1,
        ),        
    )

and

    fig['layout']['xaxis4']['rangeslider']=dict(
            autorange=True,
            thickness=0.05,
            borderwidth=1,
        ),

however the first has the desired effect while the second does some weird stuff.

what can i be doing wrong here ?

i need to use the second one because i need to be able to assign the rangeselector to an arbitrary xaxis.

thanks in advance!