"Forgot your password" with an unregistered email address results in the error message "Activation in progress"

If you enter an e-mail address in the "Forgot password" input mask that is not in the system, you will receive the response "Password reset failed, still in activation process".

The backend responds like this, for example:

{
  "timestamp": "2020-11-30T14:19:46.160+00:00",
  "path":      "/user/mail@does.not.exist/resetpassword",
  "status":    400,
  "error":     "Bad Request",
  "message":   "Account has activation key set",
  "requestId": "44a9e2e8-691498"
}