Instant scroll to bottom after Firebase load

I have a simple chat app where I have to scroll to the last message (bottom).
The messages are loaded from Firebase array objects with *ngFor directive.
I have to call content.scrollToBottom() after *ngFor and without any delay.
Now I can try using timeout, but the result it not an instant scroll, but a load of content and then a scroll to bottom.

Performing a function when ngFor has finished all entries was discussed here, perhaps that helps!

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This works, but only on Android app and I don’t know because It fires more than one times.
In iOS version on real device it doesn’t work and the app is very very slow.

I have also a side effect: when I click on a message (not last) the function fired again and I’m scrolled to the bottom. This in Android and iOS version.

Other way to solve it ?