Bug with calling locateCenterOnScreen in a loop

[forsthetwo]

This library has some bugs
When I call the locateCenterOnScreen function in a loop like the following, it takes longer and longer each time I loop, note that the two calls recognize different images

import pyautogui
for i in range(10):
    a=pyautogui.locateCenterOnScreen('a.png')
    b=pyautogui.locateCenterOnScreen('b.png')

The version of the library I'm using is 0.9.54