Scaffolding without a block below emits particles like floating sand or gravel

The bug

If you have scaffolding that does not have a block below, it will emit particles like floating sand and gravel does even though the scaffolding is not really floating. Seems like this was introduced in 1.16.210, at least I never noticed this before the update.

How to reproduce:

1. Make a scaffolding pillar
2. Make a scaffolding platform onto the pillar

Observed result: The scaffoldings emit particles like floating sand and gravel.
Expected result: The scaffolding shouldn’t emit particles because it isn’t actually floating.