I got it to work. I was playing offline earlier, so I just installed the latest update and the cursor for the door reappeared. I was able to activate it even with the door open, which it then showed the opening animation again. The cursor is slightly to the left of the opening. Activating it reset the shambler, and it let me complete the rest as normal.
Yes, when I go to the second glyph, the shambler crawls out of the hole, so I run back to the main glyph, even tried talking to the guy but he says the same thing. Shambler walks right into the protection barrier and kills me. I’ll try to get a video later