It's an album. I searched for "sound effects" on Tidal in order to compare natural sounds to the intro of Bubbles, to make sure the odd plastic sound was not my systems' fault.
I have been a table tennis player for quite a part of my youth, I know how table tennis balls sound in the real world ;-) That's a different kind of 'plastic'.
Edit: Not to be misunderstood: Yes, it's table tennis balls on the recording - but the recording is mangled somehow. Maybe to do with the 3D effect, maybe to compression or some other processing.
Will need to check SQ of Bubbles on my main system. Given that Dynamic Range of many of the tracks in the discography have values of 5-7, your comment re compression, etc., may be appropriate.
I actually sent a note to Horikawa asking why, with the interest in the sounds he uses, the recordings are so compressed. Cannot imagine that those primarily interested in portable audio are the driving force here.