Feather bar is rendered above the chat, unlike every other bar such as oxygen, health, and armour. Why does this mod not just copy how vanilla handles these bars?

To add to this issue; if you switch to a different item in your hotbar, the name is briefly shown, right? That name is also printed behind the stamina feathers. Normally the name is higher on the screen, but having oxygen bubbles moves the stamina feathers higher.

Good find, I'll fix this for the new update :)