CloudKit Dashboard error: "There was a problem saving this record type."

When trying to add a new record type in the CloudKit dashboard, I get the error:

There was a problem saving this record type.

Request ID: 232aae42-8e88-4b36-9618-d778e67e9002
What can I do to fix this error? Is it a bug? I've reported it in the feedback app.
CloudKit Dashboard error: "There was a problem saving this record type."
 
 
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