For the Festering Core strike, the objective won't update and stays on the "Descend into the Pyramidion: find a way into the Pyramidion to discover the cause of the Vex activity spike" step; cannot force a start of the next step by entering into further areas. Can explore the entirety of the strike location. I joined a session in progress, I believe, so I have no idea if there were enemies at initial spawn; however that further areas are also enemy-less. (I used a gleaming boon of the vanguard, I'm very sad that I can't complete this strike so that everyone can get the rewards ;-;)