How to use Synth.onsilence ?

[Low-Hiss-Systems]

Hello,
I am trying to get the onsilence callback to work on synths but in my code it never gets called.
I need to know when the synth is silent so I can safely dispose() of it.

Here is a snippet where it doesn't seem to be called:

const type = 'Synth';
this.synth = new Tone[type]().toDestination();
this.synth.onsilence = () => {
    console.log('silence');
    this.isSilenced = true;
};

[tambien]

I'm unable to reproduce this issue. Here's a live example: https://codesandbox.io/s/synth-onsilence-coxtx?file=/src/index.ts

[mildfuzz]

This is maybe related to this #1296