Binning of color produces wrong result

[jbonsai]

If I try to bin the color channel, it fails to encode the channel properly and the color coding is wrong. MWE and screenshots are attached.

Best wishes

MWE:

{
    "$schema": "https://vega.github.io/schema/vega-lite/v5.17.0.json",
    "config": {
        "view": {
            "continuousHeight": 300,
            "continuousWidth": 300
        }
    },
    "data": {
        "name": "data-30a68a81d8d3bdebcb5776dbb52a0fc2"
    },
    "datasets": {
        "data-30a68a81d8d3bdebcb5776dbb52a0fc2": [
            {
                "iso": 70315,
                "value": 0.6
            },
            {
                "iso": 70312,
                "value": 0.1
            },
            {
                "iso": 70500,
                "value": 0.2
            }
        ]
    },
    "encoding": {
        "color": {
            "bin": {},
            "field": "value",
            "type": "quantitative"
        },
        "x": {
            "field": "iso",
            "type": "quantitative"
        },
        "y": {
            "field": "value",
            "type": "quantitative"
        }
    },
    "mark": {
        "type": "point"
    }
}