MuseSounds can't place the same note on the same voice at the same time

I know, that title is a mouthful. I really don't know how else to describe it. I'll leave an example score below, but I'll still try my best to summarize what's happening.

I first found this issue on piano, so I'll speak relative to that, even though I THINK it happens with every instrument on MuseSounds, this is the most common example you'll probably find it on.

Imagine you have a Piano score. The bass clef is playing a sustained C#4, for example. On about the third beat of the measure, the treble clef plays an eighth note that is C#4. This eighth note doesn't play.

I'll attach my score below. It's worth noting that it doesn't seem to matter what note type or pitch it is, it won't play. It's obviously very easy to reproduce, so give it a shot.

(ps no Euphonium MuseSound? pfft, shame.)