Destructive Play Not Working in Elder Guardian Relms

I have been running the formed and the twisted maven invitations back and forth. In the elder guardian boss fight arenas I have to specifically wait for the maven to say the voice line meaning she is spawning extra bosses from other maps. Meaning if you are too fast you will kill the boss and nothing will spawn from the maven. However, this could be a intended mechanic.

It also seems that the map bosses spawned by the maven cannot drop anything while they are in the elder guardian boss arena. It could just be me, but I have done about 40 of the various elder guardian fights and I have not gotten anything from the map bosses the Maven spawns. The Shaper Guardians seem to be fine and continue to drop various guardian maps and other drops.

If anyone else is noticing this issue let me know.

Thanks!

IDK why no ones responded to this buy I am experiencing the same thing I did 50 sets of shaper guardians and got a load of maps.

I'm 20 sets of elder in and haven't seen a single map drop from the keystone bosses.