I believe the mouth part is a bit off because the toast does not line up with the mouth

When it comes to mouth cosmetics, they're actually connected to the glasses. So, for most FNaF models, the glasses will be in the correct place, but any mouth piece will look off. (Hence why Monty is practically eating every mouth cosmetic, and why Freddy's won't be properly aligned to his closed mouth). This is sadly a limitation of the cosmetics we're allowed to place, as we can't align any mouth cosmetic yet. Very sorry!

The model seems to be broken after the engine update

Yeah....average TU update as usual . For some reason it affects all my main glamrocks (excluding Bonnie). No clue why it's bugged but I'm sure it's some weird TU shader ♥♥♥♥♥♥♥. I'll try to update it as soon as I can, but my current job has me working a lot of hours and I'll be working a lot more once spring break comes. But nonetheless he will be fixed asap!

It is totally fine if it takes long. I just wanted to notify the issue with a model due to a huge update!

He's fixed now! It was a weird blender issue that was messing the textures up. I was actually already working on (very slowly mind you) on updating the main glamrocks rigs textures etc. Freddy has updated textures, new metadata stuff, and a slightly better looking rig. I'll update the others over the next few days/weeks depending on my work schedule. Enjoy!