Adafruit sparkle animation broken on RP2040, but RainbowSparkle and SparklePulse work?

`sparkle = Sparkle(pixels, speed=0.05, color=AMBER, num_sparkles=10)`

This code should look like this (code and video taken from the adafruit guide):

https://user-images.githubusercontent.com/101017273/220235696-7bfdf958-84ca-4982-ad35-4bb50bd12839.mp4

But it does actually look like this:

https://user-images.githubusercontent.com/101017273/220235797-7f151fe9-4d0e-416b-8df5-ded4ece417f8.mp4

However, the rainbowsparkle.mpy animation does indeed work (with the same code):

https://user-images.githubusercontent.com/101017273/220235979-aa422634-d5fa-4db8-9359-5fd1cf343ed2.mp4

Tested with CircuitPython 8 on a PICO RP2040

Is this animation currently broken?