Just spectating the elite race on the league I host. On lap 3 when everyone should have had DRS only a handful of people had it.
For instance P5->10 kind of range, P5/6/7/8/9 didn't get it even though they are nose to tail being held up by a low pusher, but P10 did get DRS and passed like 3 of them.
I didn't see all the instances but the field was really bunched up and only a handful of drivers had DRS.
I think I've seen people report this bug before (in fact I remember reporting it myself about 6 months ago but I don't think anyone got back to me about it) but it's definitely still happening.