Why 404 in alpha for ml/predictions?

[kotolex]

as in example here https://surrealdb.com/docs/surrealdb/2.x/integration/http#example-usage-5
if try to use it via postman or other http-client it returns 404 Not Found
But in earlier versions till 1.5.3 it returns an error
{ "code": 400, "details": "Request problems detected", "description": "There is a problem with your request. Refer to the documentation for further information.", "information": "There was a problem with the database: The model 'ml::prediction<1.0.0>' does not exist" }

Why?