I’m also having issues but found a workaround to use all the css selectors which aren’t yet supported.
Probably not a recommended solution but it works for me:
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Find the page you are trying to modify in Customizer.
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Add a Custom Liquid Block at the bottom of the page and set margins to 0 or very small.
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In the Custom Liquid block use the tag and enter your custom CSS in between
No more issues.
A good workaround if you’re just trying to edit one page (and you can always create a new template for that page if required). If you need the change across the whole site you could duplicate these steps on every page but it would get pretty repetitive.
Make sure to delete the problematic CSS from the Custom CSS box so you can save your changes.