Some people have false information with what goes on when it seems that your sprite heat doesn't go up when you feed it a material, but you're able to see the actual heat when you hover your mouse over the sprite item itself.
https://cdn.discordapp.com/attachments/293259754745233408/35669539264711...
It isn't a bug with the bar not updating correctly I'm fairly sure, and some people don't have the right idea of what's going on when this happens and may mess up/waste appetite of their pet (from what I've heard by a few players.)
Is this simple visual bug ever going to be fixed?