Arrows shot from a dispenser, through lava, facing east, land with the correct effect.
After leaving the game, and returning, the flame effect is replaced by a blue/purple potion effect.
The effect disappears shortly before the arrows despawn.
This was in a single-player world with no mods, not opened to LAN.
FIX= Other post on this: Thanks Tryashtar.
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[media]
Looks like a duplicate of MC-107941.

Thanks Tryashtar! Guess I'll search harder next time!
It happens to the best of us, haha. Happy hunting!