Problem occurs in all gamemodes, except spectator. Oddly, the snowball doesn't even touch the minecart's hitbox. This bug gets temporarily fixed when closing the world and reopening it.
Environment
Java 8, Update 101
OS: Windows Vista, 32-bit
MC-115621
When throwing a projectile (such as a snowball) while next to or in a minecart, the snowball will be immediately destroyed.
Resolved
Duplicate
0
Duplicate of MC-96588. Please use the search function next time.