Filebeat bugs not respect pattern go

[Nikolas1306 (Nikolas “Nikolas”)]

i ve used this

filebeat.inputs:
  - type: log
    enabled: true
    paths:
        - G:\\logs\\test\\*.*
        
        
parsers:
- multiline:
    type: pattern
    pattern: '^\d{4}-\d{2}-\d{2}'
    negate: true
    match: previous
             
    
output.logstash:
  hosts: ["172.19.1.12:5044"]
  protocol: "http"

and test same pattern in script go

package main

import (
	"fmt"
	"regexp"
	"strings"
)

var pattern = `^\d{4}-\d{2}-\d{2} `
var negate = true

var content = `
2022-09-30 15:32:10,165 INFO  [it.unidoc.cdr.core.request.comunicazionemetadati.ComunicazioneMetadati] (Camel (camel-1) thread #1 - seda://create) <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns="http://comunicazionemetadatirichiesta.xsd.fse.ini.finanze.it">
<soapenv:Header/>
<soapenv:Body>
<ComunicazioneMetadatiRichiesta>
    <IdentificativoUtente>FISCALCODE12334567</IdentificativoUtente>
    <IdentificativoOrganizzazione>150</IdentificativoOrganizzazione>
    <StrutturaUtente>909150909</StrutturaUtente>
    <RuoloUtente>DRS</RuoloUtente>
    <ContestoOperativo>TREATMENT</ContestoOperativo>
    <TipoDocumento>11502-2</TipoDocumento>
    <IdentificativoAssistito>DFGDFGDFGGDGF</IdentificativoAssistito>
    <PresaInCarico>true</PresaInCarico>
    <TipoAttivita>CREATE</TipoAttivita>
</ComunicazioneMetadatiRichiesta>
</soapenv:Body>
</soapenv:Envelope>

`

func main() {
	regex, err := regexp.Compile(pattern)
	if err != nil {
		fmt.Println("Failed to compile pattern: ", err)
		return
	}

	lines := strings.Split(content, "\n")
	fmt.Printf("matches\tline\n")
	for _, line := range lines {
		matches := regex.MatchString(line)
		if negate {
			matches = !matches
		}
		fmt.Printf("%v\t%v\n", matches, line)
	}
}

in kibana all line is separared

example

@timestamp
Oct 15, 2022 @ 21:11:36.605
@version
1
agent.name
nturri-HP
agent.type
filebeat
agent.version
8.4.3
ecs.version
8.0.0
host.name
nturri-HP
input.type
log
log.file.path
G:\logs\test\test.log
log.offset
5,090
message
   <IdentificativoUtente>FISCALCODE12334567</IdentificativoUtente>
tags
beats_input_codec_plain_applied
_id
ZvcP3YMBJAwwaWyTFwWT
_index
fsbroker
_score
-

see false line is ok on script go