The new crossbow just released today in snapshot 18w43a has a glitched texture for the flame enchantment. When shooting an arrow using the flame enchantment the arrows are not on fire and the arrows do nothing to the mobs. however it is not a glitch with flaming arrows because i shot a crossbow through lava and there was a flaming texture and it burned the mob.
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The crossbow does not take the flame enchantment.