Hello, this is part of commonMark specifications. Tabs at the beginning of the list turn the whole line into a code block. If you want indentation for your paragraphs I can suggest using the related editor preference.
Never mind I got it. This behavior is not intended but is, unfortunately, part of the spacing normalization we do to ensure a correct paragraph unlisting. We can eventually backtrack on this an loose some lists optimizations but at the moment we prefer to keep it as it is.