There's a bug that might been there for a long time, but I forgot to review it ever since.
When you press the shortcut button (the 4 key) to remove the transformed state for Brookes, it's missing the other benefits. For example, while slime-filled, when you use "Squeeze Out" to remove the slime state, it should also give some TP as well. It 100% works when doing it in the menu, but not out of the menu. https://ibb.co/Rk5d6y7J (I do have the slime crystal in the video by the way)
The same goes for fat (gives attack buff) and inflated state (gives agility buff). Only waterlogged works 100% even when out of the menu.