Thx for your answer but I can't pre-set the value cause it come from an HTTP call.

on my server I got a Table1 with lines pointing on Table2 I load a bunch of line from Table1, displaying them and get on the fly line from Table2 ( via services )

But as I was managing to reproduce the error without all of that, I asked on a simplier example

Moreover in my app I got a WritableSignals of a WritableSignals array of object

table = <WritableSignal<WritableSignal<Test>[]>> signal([])

that way I can trigger ChangeDetection only for the component that changed in zoneless mode, and trigger if a new component is added. But I might not be familiar enougth with angular / zoneless / signals to do things right...