The order of operation of imports means that the already-imported
instances are considered most correct (they have usually been populated
using an online source, although that is skipped in tests), so on two
consecutive test imports in a test scene, the second will lose its
online IDs completely.
This aims to ensure that all test beatmaps will have online IDs, which
is the general expected behaviour.
The triangles intro tracks video time, which is not adjusted based on
the game's playback rate (ie. it runs in realtime even for headless
tests).
Maybe we want to make the triangles video adjust its rate along with
tests?