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Just thought I'd mention as this having just happened to me brought me here, deleting the Library folder and opening again did fix it. 2021.3.5f1.
Myself and coworker are experiencing this as of two days ago on 5.6.3 and he had a deadline blown by it. In editor log I see: Downloading...
The post with the answer that everyone is referring to has been deleted? The fuq? I'm having problems exporting a prefab of a android camera rig...