Logstash sometimes parsing sometime not, even though sending the Same message

Log message

2023-05-01T05:22:20.154Z [INFO] "interSample" {"PID": 1, "Service": "XYZService", "Data": []}

some times log stash parsing successfully "_message_json_parsed"
some times parse failure "_grokparsefailure"

even though I'm sending same message, but why it's happening...
can anyone help me out with issue.

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