If you sneak, look down, and throw a snowball, the snowball will hit you in the head.
You can even throw it like 35 degrees up from straight down and it will still hit you.
Steps to reproduce:
Sneak
Look straight down
Throw a snowball
Observed result:
The snowball hits you in the head ❌
Expected result:
The snowball hits the ground ✔
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[media]

I believe this bug is the cause of MC-106151.