The bug
Soul fire sets entities on normal fire.
One would expect the blue fire to accordingly set the mob on blue fire, but the fire appears as normal instead.
Possible idea for a correction
Could potentially be fixed by making being on fire a status effect, with level 0 being regular fire and level 1 soul fire. This change would also be helpful for mapmaking and custom potions.
Linked issues
is duplicated by 53
relates to 2
Attachments
Comments 45
Probably not a bug. The blue fire burning texture probably hasn't been added yet but they're planning on adding it.
Think of chemical fire. Maybe it could start blue, and move to the normal red. Humans don’t burn red.
I think it is just a little forgetting of the developers ^^