This test scene passes at e58e1151f3c610d8019e1f1e408a1cb55d204c24 and
fails at current master, due to an inadvertent regression caused by
e72f103c1759e61c3afa7080f962c639265996c3.
As it turns out, the online lookup flow that was causing UI thread
freezes when saving beatmaps in the editor, was also responsible for
resetting the online ID of locally-modified beatmaps if online lookup
failed.
8ab3a87b13