This might be the same problem that GTK4 ran into, where the app tries to resize a window, but the new size doesn’t get applied until the next frame. Erik was working on a driver-side fix for that, but unfortunately, it didn’t pan out.
Instead, we’ve been working on a new Wayland platform library with better resizing behavior (among other improvements). It’s still somewhat experimental, but if anyone wants to try it out, we’ve got it published here:
It should work with any 560 series or later driver.