Imagine we have foo$ and bar$ and both of them are BehaviorSubjects. I have a bug in angular that sometimes in some cases foo$.subscribe(bar$) works fine, in most casses actually. But sometimes I have a bug and its not working until I do foo$.subscribe(foo => bar$.next(foo)), and even worse it seems like it works the first time and then the second time it dose not work. I experienced this bug sometimes but still rearly. Not sure even how to make a proper minimal reproduction. I would like to understand what makes this causing the bug? And is the angular team aware of it? I didn't see anywhere so far anyone posting about it. Have checked if it solves anything by removing zonejs and it dose not. Continue reading...