EDIT: Restarting the game seems to have worked. This is no longer a problem for me.
Relatively new light here. Doing the "Reforging The Past" mission on Europa as part of the Lost Lament exotic quest.
During the mission, enemies do not spawn in creation, and the reforging sequence (at the end of the mission I assume) does not start.
I made sure to clear out all non-respawnable enemies and complete all objectives I could before encountering the problem. Nothing seems to be working. I will restart the game and update accordingly.
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For some missions, if you complete parts too quickly for the game to recognize they are complete, it softlocks. This may or may not be the problem, but it helps to know.