Hey there,
Thank you for reporting.
We're aware of the bug with the 7th oracle but it's not needed to upgrade whisper of the worm fully. You can follow this guide for more information: https://www.eurogamer.net/destiny-2-whisper-of-the-worm-god-roll-drop-how-get-9419.
English
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Whispered Breathing 4 is locked behind the 3rd group of oracles (5/6/7) - so you can't fully upgrade it. Whispered Breathing 4 is required for the stocks
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omg thank you!!
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I have completed the mission. I have handed it in to Eris and I still can't do this. And the quest is no longer in my menu. Please just watch the video you requested last time and let me know if there's anything else I can try :(