We've had plenty of teasers before, but usually they're snippets of the final track or near-final track with vocals. A recent example is probably the melody of Sayonara being shown off for a short bit, or the "Yes, we are the queens" from a-nation a while ago.
This is not the same kind of thing at all.
It looks like some Japanese fans were curious and wondered what it was when it first popped up with the name "Spotify" in their tweet and Spotify support replied after seeing how strange it looked, lol. "Does it display like that for you still? Please let us know your specs!"
https://twitter.com/A_world_ayu/stat...72840476442625