We were sending unrendered `PayloadComponent`s to the client, which is a
remnant of old betas where those were actually rendered.
There is no point sending them to the client as they are useless there
and cannot be rendered without the server-only importMap. Additionally,
this could have potentially caused server-only modules to be sent to the
client (e.g. if serverProps was used), which would have lead to a
webpack error.
The types were also incorrect, as admin.dependencies on the ClientConfig
did not contain the React nodes.
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