After clicking a lama or wandering trader lama, the locations of buttons on screen are reset to default, if using "Joystick & aim crosshair" mode and having customized the controls. Size and location are reset, while transparency is not reset.

During my testing i have only been able to replicate this bug in survival mode, not in creative mode. Additionally, the reset only happened, when buttons are placed close to the upper border of the screen.

This bug doesnt apply to horses and donkeys ect, only to lamas.

The two attached files show two button layouts, mostly default positions, but note the different positions of the "use"-button. I found that the first one will not cause a reset, but the second one (the use-button is on the top screen border) will do so reliably in survival mode.