The bug
If you will throw snowball through lava, it will light up. It works in all versions. Other items that you can throw, will light up too, but snowball looks very strange.
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Lol, weren't ghast fireballs once flaming giant snowballs? Like, before fire charges were added? Also, I'm fairly certain this is intended. All projectiles do this.
Relates to MC-7697.
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Can confirm that the snow ball starts burning when it passes through lava, I guess this is technically normal, but it doesn't make much sense for snow to burn... Also can confirm for 20w51a