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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.
This protocol extension has not changed in a long time, is widely supported, and no upcoming breaking changes are planned.
The interface names are left unchanged, so that compositors and clients don't need to be updated. In particular, the legacy "z" prefix is still part of the interface name.