REFID: 3,379,950,965 - Valley of Titans, Green Nexuses not Spawning Enemies to Complete

Hello,

In the Valley of Giants, when you are clearing the Green Nexuses (unsure what they are formally called). It automatically spawned the enemies for each of the 3 "Green Nodes" and sealed 2/3 of them; the 3rd one (which was the 1st one I encountered) remains unsealed; but enemeies do not spawn for me to complete it.

Edit: I was just told this is a "Abyss" mechanic and bugs often. So guess now I know.