No memory fragment drop from boss in Laboratory map

Did my 1st Laboratory map run while in a Shaper-controlled area. The boss didn't drop a memory fragment.
#SadPanda

Same. Ran 2 Maps (Overgrown Ruin and Mud Geyser). Both had no memory fragment drops.

Had two succesful memory fragment drops. However, no memory fragment drops from geode and armoury even though it said the endbosses carry a fragment.

I had something similar today.. ran a rare Vault with Shaper influence and Memory Fragment on the Atlas.
Killed the boss.. nothing: no fragment, also no piles clickable.
Ran it again - this time white - even though there was no MF any longer on it: I got it.

Don't know what happened there, but seems a bit buggy sometimes.
I guess it's quite hard to reproduce/fix.

I am fairly sure that you only get the fragment if the map is under elder influence (shaper influence is not enough), not sure if this is intended or not, seeing as the map has the blue circle around it on the atlas either way.