FluidSynth Output is Hopping Around Channels L and R

Using Zynthian
9

UPDATE:

Today I booted Zynthian and it loaded the stereo piano session from yesterday 1#FS (fluidsynth 2.09 /w soundfont app. 140MB). The hopping has reappeared. Which means, it has nothing todo with fluidsynth 2.10 beeing leaky. (see here):

https://discourse.zynthian.org/t/fluidsynth-broken/3704/16

Here is the soundfile for you @wyleu:

And now the strange part (again): after 10 minutes the hopping is gone.