The Bug
If a projectile is thrown through lava, it's set on fire since it's an entity. If it then hits a TNT it ignites the TNT. But if the flaming projectile hits a mob it won't set them on fire.
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I can confirm, this is still the case in version 1.21.5. I wonder if this is because arrows are coded to be able to provide fire damage(flame), and the other items do not have any variants that can set other objects on fire. Throwable or even dropped, I believe that every entity is programed to be able to be lit on fire but doesn't necessarily carry fire damage with it. I’m assuming with the way it is set up, it was not intended for these to apply fire to other entities similar to arrows, but it probably would be a nice touch if added. This is just my take on this bug report, and I am not a moderator, so if a moderator decides otherwise, please follow what they say.
-Isaiah0Jackson
Can confirm. Only burning arrows set mobs on fire, but tridents, snowballs etc. don’t. Probably intended.