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I would like to reopen this ticket as it seems to be broken again after upgrading to Angular 9.  I have several StackBlitz repos, but can't get the Angular 9.0.2 one to load.

The following work:

When trying to upgrade the last one to Angular 9 it tells me I need to add tslib dependency.  I do, but then the toolbar buttons disappear.

Note this is only when trying to create a reproduction for you in StackBlitz.  

In my own code, I don't have to add tslib and the toolbar draws just fine.  However, when toggling the button's disabled, it doesn't work.  The button is always disabled.