Default "sizes" attribute gets truncated

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1

I’d like to add a default sizes attribute to my images. Setting defaults in system.yaml works, but the sizes attribute gets truncated after the first comma.

Setting:

images:
    defaults:
        sizes: '(min-width: 36em) 50vw, 100vw'

leads to:

sizes="(min-width: 36em) 50vw"

Is there any way around this?