Ice Crystal on Top of Andesite

I found ice crystals on top of andesite.

Steps to reproduce

1. Create new world in creative with seed -1608577060433118060

2. Run command /tp 757 19 815

3. (x) There are ice crystals on top of andesite

Expected result

Ice crystals should only spawn on top of packed ice.

Actual result

There are ice crystals on top of andesite.