expectScreen() not working properly

[GEOEGII555]

Please include the following information:

vncdotool version
1.2.0
VNC server and version
QEMU Integrated VNC server
Steps to reproduce

• client.expectScreen("arch_cleared.png")

Expected result
It should wait until the screen becomes the image I applied.
Expected screen:

Which erroneous result did you get instead
It instantly exited like if the screen matched the image, even tho it's not.
The image that it exited at (they don't match):

Additional information
I've tried multiple maxrms values: 0.0, 15.0, 25.0, but the result was the same, changing maxrms did nothing.