This has happened to me in three consecutive Glassway strike attempts via the vanguard playlist. This happened before today's patch and after. We would get to the ring for the radiolarian lake and no enemies would spawn and ring progress would not lower the lake. One time, all the enemies spawned under the lake, but the lake progress would not change. It would not allow me to wipe. I tried getting to the end to see if it would progress the strike steps, but I was not successful.