Zana missions removing Syndicates

Whenever I encounter Zana in a map, if I do her mission right away and not kill the syndicate in my current map, it will despawn when it appears in the Zana instanced map mission.

Tested it 4 times and it occured all 4 times.

Is this actually supposed to happen?

This seams to happen any time you change zones causing a new syndicate encounter, I noticed it a lot while levelling: start in zone A, move to adjacent zone B (in the case of maps a zana map), clear zone B including syndicate encounter, return to zone A, and stumble upon what would have been a syndicate encounter (abandoned goods train or fortification or research entrance), but the encounter is gone [I assume consumed by doing the encounter in zone B].

At least until it is patched it can be avoided with backtracking, skip zana encounter until after you have finished the syndicate encounter for the map.