Grafana managed alerting with operation math not working

When using the an operation other then classic the ruiles gives error

“invalid format of evaluation results for the alert definition : frame cannot uniquely be identified by its labels: has duplicate results with labels {}”

  • What Grafana version and what operating system are you using?
    Grafana 8.3.3 on RHEL8 and 7
  • What are you trying to achieve?
    Create a alert rule based on a query and math condition
  • How are you trying to achieve it?
    A = the query
    B = the math condition $A > 3
  • What happened?
    Query results show good results in true and false (1 and 0) outputs
    The alert preview shows an error as mentioned above
  • What did you expect to happen?
    Alert being generated without error
  • Can you copy/paste the configuration(s) that you are having problems with?
    NO
  • Did you receive any errors in the Grafana UI or in related logs? If so, please tell us exactly what they were.
    No gui error but an error after preview alert
    “invalid format of evaluation results for the alert definition : frame cannot uniquely be identified by its labels: has duplicate results with labels {}”
  • Did you follow any online instructions? If so, what is the URL?
    No

My query (A)
node_load1
My math rule (B)
$A < 1

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