Do resonate stems not drop on Mars anymore? I haven't had any drop since Shadowkeep released. I need 2 more sleeper nodes and Eye in the Dark bounty for wayfarer and Spyder never has that bounty and the stems no longer drop.
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If you have the Nascent Dawn quest active in your pursuits then that is the likely cause. The Nascen Dawn has two steps in it that require you to go visit a particular node. Until you clear those steps you won't be able to obtain new stems and you won't be able to combine existing stems.