Forge 1.16.4-35.1.13
AS 1.16.4-1.13.6
Botania 1.16.4-410
When an Open Crate from Botania drops a Rock Crystal, Celestial Crystal, or Starmetal Ingot, the items completely spaz out and fly multiple blocks in a random direction. They can even get stuck in other nearby solid blocks. No other items from either mod do this, so I assume this is an issue with how the item entities from these items are created.

Also happens with vanilla droppers pointing downwards, and presumably Quark chutes. Caused by a larger hitbox of the entity - 0.5^3 instead of vanilla 0.25^3.