[filebeat 8.5.3] extracting log_level from message with dissect processor, failing Right padding modifier

console.txt

# filebeat version
filebeat version 8.5.3 (amd64), libbeat 8.5.3 [6d03209df870c63ef9d59d609268c11dfdc835dd built 2022-12-04 04:51:48 +0000 UTC

filebeat.yml

filebeat.inputs:
- type: filestream
  id: app-services
  enabled: true
  paths:
    - /opt/tomcat/logs/app-services.log
  tags: ["tomcat", "app"]
  parsers:
    - multiline:
        # Any line that starts with these contents should be considered the start of a new log entry
        type: pattern
        pattern: '^I:'
        negate: true
        match: after
  processors:
    - dissect:
        target_prefix:  ""
        tokenizer: "I:%{log_level->} [%{thread}] %{class} %{log_time}: "
        field: "message"
        ignore_failure: true
    - timestamp:
        # Processing to set the @timestamp field based on the log.
        field: log_time
        ignore_missing: true
        ignore_failure: true
        layouts:
          # Define the layout using reference time = 1136239445
          # https://pkg.go.dev/time
          - '02 Jan 2006 15:04:05.000'
        test:
          # This section just allows us to copy paste timestamps
          # from the log and validate one of the layouts can parse
          # the timestamp from the test timestamp.
          - '20 Dec 2022 00:00:40.584'
        timezone: Local
    - drop_fields:
        fields:
         - log_time

filebeat.config.modules:
  path: ${path.config}/modules.d/*.yml
  reload.enabled: false

output.logstash:
  hosts: ["localhost:5044"]

mongolog.txt

> db.filebeat.findOne({"log.file.path": "/opt/tomcat/logs/app-services.log", "log_level": "DEBUG " })
{
	"_id" : ObjectId("63a1fe694244c574f0000005"),
	"@timestamp" : ISODate("2022-12-20T18:25:00.929Z"),
	"log" : {
		"file" : {
			"path" : "/opt/tomcat/logs/app-services.log"
		},
		"offset" : 11123820
	},
	"message" : "I:DEBUG  [appTaskScheduler-8] CustomHeaderClientFilter 20 Dec 2022 13:25:00.929: Added header X-Requested-With:XMLHttpRequest to request context org.apache.cxf.jaxrs.client.spec.ClientRequestContextImpl@53578c30",
	"class" : "CustomHeaderClientFilter",
	"log_level" : "DEBUG ",
	"@version" : "1",
	"thread" : "appTaskScheduler-8",
	"tags" : [
		"tomcat",
		"app"
	]
}