The fossils found in the new Soul Sand Valley biome in 1.16 snapshot 20w06a sometimes spawn floating in midair, and not attached to the ground.

Seed: 6769813092180983410

Coordinates: -53 33 605

Generally only pieces of fossil are found floating, ones that are part of a larger fossil as a whole but not specifically attached, with at least one of the pieces of the whole touching the ground.

Xisumavoid made a video on YouTube going over (mostly) everything new with 20w06a, and also noticed and pointed out that a part of a fossil was floating. (https://www.youtube.com/watch?v=jxLytC1nAIo @ 2:59)