Summon Reaper and Summone Reaper of Revenants inconsistent gem behaviour

If I Summon 3 Reapers of Revenants and then summon Normal Reaper (from non-transfigured gem), whenever i try to use Normal Reaper's active ability it instead resummons normal reaper and unsummons one of the revenants.

HOWEVER
if i summon 3 reapers of revenants and then summon normal Reaper and then resummon 2 revenants, so that normal Reaper is the oldest minion out of 3, i can use Normal Reaper's Active ability just fine.

Other odd interactions between Summon Reaper and Summon Reaper of Revenants:
Summoning Normal Reaper and then summoning a Reaper of Revenants Unsummons Normal Reaper.
Summoning Normal Reaper after summoning all 3 Reapers of Revenants keeps 2 Revenants and 1 Normal Reaper. Summoning a Reaper of Revenants after that replaces one of the revenants.

I really hope they fix this weird interaction. It is really annoying. Unfortunately, I have a feeling that they didn't want us to have 4 reapers or 2 mini reapers with one fully functioning one. Their way of fixing it might just be that both gems fully cancels the other out so that they can't be used together.

I noticed when it works and when it doesn't.
If you enter a map or instance for the first time, it works. If you go, for example, to trade or to a vendor via the portal and come back, it no longer works.
So when you enter the map you have to do it without leaving :(