Hoi Andrew,
I will do the inxclude_xml and send you the results.
At the moment alle Sysmon events are affected.
Below a raw event without the include_xml how I found out where the event fields got lost.
{"event":{"kind":"event",
"provider":"Microsoft-Windows-Sysmon",
"code":"3",
"created":"2021-11-19T09:52:32.776Z",
"type":["connection","start","protocol"],
"category":["network"],
"module":"sysmon"},
"process":{"pid":2804,
"executable":"C:\\Windows\\System32\\svchost.exe","entity_id":"{d8a96ee4-b0ee-6174-3b00-000000000400}",
"name":"svchost.exe"},
"host":{"name":"hostname"},
"@timestamp":"2021-11-19T09:52:26.720Z",
"network":{"community_id":"1:qCRjr9xiBSRu+qkHzbvzbfTpwDQ=",
"direction":"egress",
"protocol":"-",
"type":"ipv4","transport":"tcp"},
"rule":{"name":"technique_id=T1043,technique_name=Commonly Used Port"},
"tags":["beats_input_raw_event"],
"user":{"name":"SYSTEM","id":"S-1-5-20","domain":"NT AUTHORITY"},
"source":{"port":53326,"ip":"ip","domain":"-"},
"log":{"level":"information"},
"destination":{"ip":"ip",
"port":8080,
"domain":"-"},
"related":{"user":"SYSTEM",
"ip":["ip","ip"]},
"ecs":{"version":"1.11.0"},
"@version":"1",
"winlog":{
"record_id":1315815,
"event_id":"3",
"process":{"pid":5145,"thread":{"id":7204}},
"event_data":{"SourcePortName":"-"},
"computer_name":"hostname",
"version":5,
"channel":"Microsoft-Windows-Sysmon/Operational",
"provider_guid":"{5770385f-c22a-43e0-bf4c-06f5698ffbd9}",
"api":"wineventlog","user":{"name":"SYSTEM","identifier":"S-1-5-20","type":"Well Known Group","domain":"NT AUTHORITY"},
"provider_name":"Microsoft-Windows-Sysmon"},
"beat":{"name":"name","ip":"ip"},
"agent":{"name":"name",
"ephemeral_id":"03f884d6-508e-4681-b762-893702a319d6",
"type":"winlogbeat","id":"eb576931-18a0-4a71-9826-758b4fd41e6f","version":"7.15.2","hostname":"hostname"}}