Steps to Duplicate

1. start playing and hit pause
2. open the speed modal
3. choose 2.0x
4. tap outside of modal to close it
5. hit play.

Track will continue to play at original speed (1.0x) while the speed-display will say "2.0x".

If you instead do steps 2-5 while in play-state (not pause), then the audio will play at the new speed that is chosen.

Steps 1-5 only seem to break when the speed is increased.

If, for example, you are in "2.0x" mode with audio playing at 2.0x, and you tap pause to change the speed to 1.0, playback will correctly return to the slower speed when play is tapped afterwords.