Angular 4+ Bubble stuck on screen

Hi
Running daypilot-pro-angular 8.4.3027.tar.gz and Bubbles does not seem to react on mouse out, bubble stays on the screen even if mouse is moved outside the "schedule view".
If I revert to an older 8.4.2954.tar.gz it starts working again.

Known problem ?
setting hideAfter property in
cellBubble: new DayPilot.Bubble({
showAfter: 0, animated: false, position: 'Mouse',
onLoad: (args) => {
....
}
}
),
does not help, same with event bubbles
BR MT