Issue with Block Spacing in Webflow App Style Guide

Sorry if this has been addressed (I tried searching in Slack but didn't quite see what I'm seeing so far). When using the Style Guide + Site Builder Webflow App, I can't get the imported items to use Block Spacing. My preferences are set to "Spacing Blocks" in both places (and using 3.0 of the starter project) but the imported site is still using margin classes. Is there something that I missed?