Versions:

• Jenkins: 1.644
• Workflow plugins: 1.12
• Log Parser Plugin: 2.0

Issue:
I have the following workflow job:

node {
   step([$class: 'LogParserPublisher', parsingRulesPath: '/var/lib/jenkins/jenkins-rule-logparser', useProjectRule: false])
   echo 'Error: oh no'
}

and it produces the following console output:

Started by user anonymous
[Workflow] Allocate node : Start
Running on master in /var/lib/jenkins/jobs/ntsvc-monitor-dev/workspace
[Workflow] node {
[Workflow] step
[Workflow] echo
Error: oh noes
[Workflow] } //node
[Workflow] Allocate node : End
[Workflow] End of Workflow
Finished: SUCCESS

The log parser config (/var/lib/jenkins/jenkins-rule-logparser) is:

error /Error/

The parsed log view shows only:

Started by user anonymous
[Workflow] Allocate node : Start
Running on master in /var/lib/jenkins/jobs/ntsvc-monitor-dev/workspace
[Workflow] node {

For a FreeStyle job, the same echo message and log parser rules, results in fully parsed log and the error message is detected/colored red. See attachments for views of parsed log screens.

The Jenkins system log does not contain errors for the jobs or the Log Parse plugin... indeed, it contains success messages from the Log Parse plugin.