in pipeline mode, the output of echo commands are not captured by Splunk.

Example job:
node('centos-small') {
  sendSplunkConsoleLog {
    stage('stage 1') {
      echo "toto"
{{    }}}
    stage('stage 2') {
      sh "echo titi"
{{    }}}
{{  }}}
}

Jenkins console output:
[Pipeline] node
Running on WE1-P1-ALMT-TDF-aes-08dwq in /home/jenkins/workspace/Personal/dupor0/test-splunk
[Pipeline] {
[Pipeline] sendSplunkConsoleLog
[Pipeline] {
[Pipeline] stage
[Pipeline]

[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (stage 2)
[Pipeline] sh
+ echo titi
titi
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // sendSplunkConsoleLog
[Pipeline] }
[Pipeline] // node
Splunk query:

index=jenkins_console host="jenkins-aes.bpweb.bp.com" source="job/Personal/job/dupor0/job/test-splunk/5/console"|reverse| rename _raw as Event| table _time, Event

Returned by splunk:

The output from Stage 1 is missing. And from what I've noticed, the output from echo commands is never captured.