Was playing Maliwan Takedown with my group last night all of has the ADS while DBNO perk and we all noticed that we could not ADS while down. Not sure if this is a bug or what.
Yes, this is a known issue - all the GR perks appear to be affected. GBX is aware and is working on the issue, but is not in a position to offer an eta on a fix.
Closing since there are already multiple threads on this.