I ran a 11-20 tier fractal while having an active Daily Scale 11-20 Fractal daily and was able to obtain the bonus chest from that fractal as well.
Although I have not ran 1-10, 21-30, 31-40, or 41-49, it seems like no one is getting bonus chests from these tiers. However, people are getting chests from scale 50. My guess is that the issue is due to the coding of the new dailies that involve running fractals of a particular scale.
Edit: I just ran 1-10, did not receive daily chest.
Edit: I was sure I was going to get a zojja’s ascended weapon chest for each of the fractal tiers I was eligible to do