Description

When applying duotone as a block style in theme.json, there are still a couple places the duotone filter doesn't get applied.

See #34667 (comment)

The thumbnail for block patterns that use duotone won't show the filter applied:

The site editor shows the image without a filter but the frontend works fine. The post editor when I insert an image does work fine:

To reproduce

You can test on Skatepark applying Automattic/themes#4740

Or by adding the following to your theme.json for testing the image and cover blocks.

{
	"styles": {
		"blocks": {
			"core/cover": {
				"filter": {
					"duotone": "var(--wp--preset--duotone--blue-red)"
				}
			},
			"core/image": {
				"filter": {
					"duotone": "var(--wp--preset--duotone--blue-red)"
				}
			}
		}
	}
}