Media "sizes" doesn't render properly with markdown syntax

[JordanGuiz]

Hi,
I was trying to set media queries for some images in the markdown editor, and I found out a problem with the "sizes" attribute.
In the dedicated part of the tutorial called sizes-with-media-queries, the example is supposed to establish two image sizes, depending on the size of the screen : 100vw when the screen is smaller than 26em, 50vw for bigger screens. The problem is that the resulting html only has the first size specification "(max-width:26em)+100vw" and not the second one for bigger screens...
Could this be fixed easily?