Regression caused by #3710, reverting the commit removes the bug.

Steps to reproduce:

1. Connect any instrument to a midi controller with a sustain pedal/button
2. Hold down the sustain pedal/button
3. Press any key more than one time
4. Only the first key press will register and the consecutive keys won't work or produce any sound until you release the sustain pedal.

If you revert the said commit, in case of stable-1.2:

git revert d87a8b3da4976b669600972c4e731f8a4f6a6fb5

The behavior is as expected, they keys keep playing the same sound and layering over one another.

If my steps are unclear I can provide a video.

Tagging @serdnab as the author of the PR.