I have run this 3 times. During the first time, the checkpoint progressed and spawned in the boss. However, after killing him, the checkpoint reset to the initial starting point, and the chest never spawned. The second time thru everything worked perfectly. This last time once again checkpoints progressed up until we spawned and killed the boss. However, upon killing the boss, the checkpoint reverted to a previous part of the mission, and no chests spawned and no loot was given.
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Hello there, Thank you for your report. We have received reports of an issue impacting Expeditions. As per our [url=https://help.bungie.net/hc/en-us/articles/39007140765204-Destiny-2-Year-8-Known-Issues-and-Vital-Information]Known Issues[/url] page: [quote]Expedition activities can sometimes not fully complete. [/quote] 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.