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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
If the kernel supports modifiers and the GPU is a Turing+ then force using zink instead of nvc0.
https://www.collabora.com/news-and-blog/news-and-events/goodbye-nouveau-gl-hello-zink.html