Message being truncated(?) when using the RollingLogFileAppender through ParallelForwardingAppender

[torndar]

When I log directly to the RollingLogFileAppender I get output like this:

INFO  2015-04-30 15:24:48,789  1263(ms) INTERNAL.APP.60                Run                - APP Started
DEBUG 2015-04-30 15:24:49,039  1513(ms) INTERNAL.APP.60                RunDailyJobs       - Looking for Daily jobs that are ready to be run.
DEBUG 2015-04-30 15:24:49,413  1887(ms) INTERNAL.APP.60                RunJobs            - Running [0] jobs
DEBUG 2015-04-30 15:24:49,413  1887(ms) INTERNAL.APP.60                RunWeeklyJobs      - Looking for Weekly jobs that are ready to be run.
DEBUG 2015-04-30 15:24:49,429  1903(ms) INTERNAL.APP.60                RunJobs            - Running [0] jobs
...
INFO  2015-04-30 15:24:49,554  2028(ms) INTERNAL.APP.60                Run                - APP Completed

But when I log through ParallelForwardingAppender I seem to lose the last portion of each message. It seems to lose the %-18.18M - %message %newline portion of the conversion pattern (including the newline so all the below really does show up as one line).

INFO  2015-04-30 15:27:10,174  1435(ms) INTERNAL.APP.60                DEBUG 2015-04-30 15:27:10,283  1544(ms) INTERNAL.APP.60                DEBUG 2015-04-30 15:27:10,579  1840(ms) INTERNAL.APP.60                DEBUG 2015-04-30 15:27:10,595  1856(ms) INTERNAL.APP.60                DEBUG 2015-04-30 15:27:10,611  1872(ms) INTERNAL.APP.60                DEBUG 2015-04-30 15:27:10,611  1872(ms) INTERNAL.APP.60                DEBUG 2015-04-30 15:27:10,626  1887(ms) INTERNAL.APP.60                DEBUG 2015-04-30 15:27:10,626  1887(ms) INTERNAL.APP.60                DEBUG 2015-04-30 15:27:10,626  1887(ms) INTERNAL.APP.60                INFO  2015-04-30 15:27:10,626  1887(ms) FileMovement.APPFileMovement   DEBUG 2015-04-30 15:27:10,673  1934(ms) FileMovement.APPFileMovement   DEBUG 2015-04-30 15:27:10,704  1965(ms) FileMovement.APPFileMovement   DEBUG 2015-04-30 15:27:10,720  1981(ms) FileMovement.APPFileMovement   DEBUG 2015-04-30 15:27:10,735  1996(ms) FileMovement.APPFileMovement   DEBUG 2015-04-30 15:27:10,751  2012(ms) FileMovement.APPFileMovement   DEBUG 2015-04-30 15:27:10,751  2012(ms) FileMovement.APPFileMovement   INFO  2015-04-30 15:27:10,751  2012(ms) INTERNAL.APP.60

The appender configuration is:

<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
  <file type="log4net.Util.PatternString" value="D:\\APP2012\\Logs\\APP.%property{InstanceId}.txt" />
  <appendToFile value="true" />
  <rollingStyle value="Size" />
  <maxSizeRollBackups value="10" />
  <maximumFileSize value="10MB" />
  <staticLogFileName value="true" />
  <layout type="log4net.Layout.PatternLayout">
    <conversionPattern value="%-5level %date{ISO8601} %5timestamp(ms) %-30.30logger %-18.18M - %message %newline" />
  </layout>
</appender>