How Do I Level Up My Pets?

One of my Wybels has been at 100% EXP for a long time, throughout multiple LI runs and mobs I've killed with it equipped, but it seems to be stuck at level one. Is there a command I have to use to make it level up, or is it supposed to do it automatically?

 

I think that's a bug, since my pet seems to level up automatically. I'd suggest putting this in bug reports as well as here

 

Honestly I don't know how I'd format it in bug reports. >.> They ask for a summary, a description, (which sounds like the same things to me) as well as steps to reproduce. I don't know what I'd write to fill out the form

 

Description could be something along the lines of 'my pet is stuck at 100% xp and won't level up'. Summary you can put the same thing but it's essentially just a shorter version of the description (a title or a TLDR). Steps to reproduce, you could just put pet gaining xp, since you don't know why it happened