Which package(s) are affected?

Virtualizer (@lit-labs/virtualizer)

Description

Gray already figured out the fix for this. Just adding to an issue to get this added to sprint plan...

Reproduction

This demos the issue with an 80px padding for the element containing the virtualizer
https://lit.dev/playground/#gist=3f55b065eb257cbaf21b1168cbb65093

Workaround

n/a

Is this a regression?

No or unsure. This never worked, or I haven't tried before.

Affected versions

masonry preview and 0.7.2

Browser/OS/Node environment

n/a