Looks like there is an issue where the curse item can spawn under the floor, effectively locking players from completing the fight. The only fix I've been able to find so far is to completely restart the level and *hope* it doesn't happen again.
https://www.reddit.com/r/destiny2/comments/1iobk4o/bug_related_to_the_new_quest/
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Hello there, Thank you for reaching out and for the footage and link. We have taken note of your report and will be investigating the underlying cause of this issue. Your patience while we look into this is appreciated. For any updates on this issue, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News [/url]page.