I have two displays using wayland. I setup my yakuake to always open at mouse location and 60% of display width centered horizontally. his actually works - but not with the following scenario:

1.
Move your mouse to screen 1 and click somewhere. Then press your shortcut to open yakuake, It opens in the upper middle.

2.
Close it again with the shortcut.

2.
Move your mouse to the screen 2 and press the shortcut again.

In my case yakuake opens up on screen 1 in the upper left instead of screen 2 in the middle.

As soon as you click the mouse button in the "new" screen, it works. So it seems that the click makes a difference. Without a click, yakuake uses the previous screen for showing up.

Tell me if you need more information when you can not reproduce.