Twenty Twenty theme: blocks available space is too narrow in editor when the Full Width Template is selected

[aljullu]

When selecting the Full Width Template in Twenty Twenty, the page content is up to 1200px wide in the frontend.

However, the editor has a ​CSS rule that forces .wp-block max-width to 610px.

That produces a styles mismatch between the editor and the frontend. This issue is specially visible in blocks that have different layouts depending on the container width, like the WooCommerce Checkout block (see screenshots), but is still reproducible in any other block (see how the paragraph block line breaks do not occur on the same words editor vs. frontend).