Cross saved my PC to Xbox and was perfectly fine until a couple of days ago it got rid of my renegades and my lightfall dlc
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Expansion licenses don't transfer with Cross Save and Destiny 2 is not a play anywhere title.
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Expansions aren't meant to carry across platforms via cross-save, they have to be repurchased on each platform you want to use them on due to platforms controlling the licenses. Is it Xbox or PC you're having issues with?