Watch the video attached.
This doesn't affect the real loading process behind. When you stop moving the window, the loading animation goes faster to finish itself.
MC-143780
Dragging the game's window while loading the main menu freezes it's animations
Resolved
Works As Intended
0
This is just how the game UI works (and windowing in general - sometimes). As you can see at the end, this is true for the title screen also, the panorama doesn't update when you're dragging the window around.