Multiline parser with tail not working as per the example

[rpzdev011]

Bug Report

Description
Multiline parser with tail not working as per the example, output looks incorrect.

To Reproduce

• Rubular link if applicable: https://rubular.com/r/FbDe8bO8oBpJHR (is correct)
• Example log message if applicable:

single line...
Dec 14 06:41:08 Exception in thread "main" java.lang.RuntimeException: Something has gone wrong, aborting!
another line...

• Steps to reproduce the problem:
  Using multiline parser example here

Expected behavior
the "single line..." & "another line..." part must be filtered out leaving only the matching line "Dec 14 06:41:08 Exception in thread "main" java.lang.RuntimeException: Something has gone wrong, aborting!" and producing log output:

[1] tail.0: [1669160706.737657687, {"date"=>"Dec 14 06:41:08", "message"=>"Exception in thread "main" java.lang.RuntimeException: Something has gone wrong, aborting!

however the example is showing "single line..." & "another line..." included in the log output.

Your Environment

• Version used: 3.1
• Configuration: as per here
• Filters and plugins: Multiline