Histogram2dContour: Choosing contour start and end with histnorm="probability"

Hi,

I am trying to create a go.Histogram2dContour object where histnorm="probability" and so the contours have values between 0 and 1. I then wish to set the contours to be at steps of 0.1 from 0.1 to 1. However using a contour dict does not seem to interact well with histnorm and nothing is plotted. I was wondering if there was another way to do this?

My exact code is:

    hmc_plot = go.Histogram2dContour(
        x=hmc_samples[:, 0].tolist(),
        y=hmc_samples[:, 1].tolist(),
        contours_coloring="lines",
        histnorm="probability",
        contours=dict(
            start=0.1,
            end=1,
            size=0.1,
        ),
    )

Any help is much appreciated, thank you!