When a "Lingering" potion is thrown into lava, it spawns an up-scaled fire object. This does not happen with Splash potions, only "Lingering".
I attempted to capture video, if you like to see it, here is the link:
https://www.youtube.com/watch?v=xvVJgJJVT8A&feature=youtu.be
Linked issues
Comments 2
...of MC-85863
Sorry, this is a duplicate.