SecOps Parser - error failed: field \"severity\": index 0: received non-string raw output for enum field"

With below code, and where by "linktargetport": "389(ldap)"

        if ![no_linktargetport_found] {
          mutate {
            replace => {"targetport" => "%{linktargetport}"}
            gsub => ["targetport", "[^0-9]", ""]
          }
          mutate {
            convert => {"targetport" => "integer"}
          }
          mutate {
            convert => {"targetport" => "string"}
          }
          mutate {
            replace => {
                "cse_event.idm.read_only_udm.target.port" => "%{targetport}"
            }
          }
        }
      }

this errors out with  (the two converts was a suggestion from gemini...)

LOG_PARSING_CBN_ERROR: "generic::invalid_argument: failed to convert raw output to events: failed to convert raw message 0: field \"idm\": index 0: recursive rawDataToProto failed: field \"read_only_udm\": index 0: recursive rawDataToProto failed: field \"target\": index 0: recursive rawDataToProto failed: panic encountered: non-signed-integral type given for backstory.Noun.port: string \"389\""

With only the first convert, so only converting to integer

LOG_PARSING_CBN_ERROR: "generic::invalid_argument: pipeline failed: filter mutate (43) failed: replace failure: field \"cse_event.idm.read_only_udm.target.port\": source field \"targetport\": source field value must be a string"