I don't have any enemies spawning in the Lost Sector "Chamber of Starlight" in the dreaming city. I tried "Bay of drowned wishes" after it and there I had spawns so it seems like its a bug with that specific lost sector.
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I had this issue today with this exact Lost Sector. I had to go back to orbit and load back in to get them to load (even had Ascended and it was not showing the portal). After a reload into the location it worked fine. I did not take video, but essentially no enemies spawned, the corrupted portal did not spawn, and the boss chest was there but said it required the boss key. This happened to me about 20 minutes ago from this post.