Silent chord mystery - or is it a bug... see second video too

Hello folks, there must be a user error here but I can’t figure it out.
Why is the last chord silent, I did not make it silent!?
Thanks!

furthermore, when I alt drag the silent chord to create a duplicate, the duplicate works normally! So this does seem to be a bug?
see here

According to the color of this chord, it is muted. Shift+ click on it to unmute.

Thanks, I will try that when it’s on again… but I wonder why is there NO right mouse contextual mute/unmute??? major miss IMO, a huge thing that is missing, especially given there is no menu… so how is one meant to unmute without knowing the keyboard shortcut?

A little bit shy, but it is there in User Manual:

I would like to see all shortcuts that work in Scaler 3.

@Tristan Is it possible to have a list of shortcuts like this or Alt + drag to copy chords. These shortcuts are very helpful.

It’s obviously the kind of thing that MUST be available to the user without having to resort to memorizing the manual. Right mouse menus are called CONTEXTUAL for a reason… They know your context and offer relevant options… Like to Unmute the muted clip that you right mouse clicked on!