Hi - 

I have wrote an appender which use `setMDCPropertyMap` to inject some fields to 
LoggingEvent. 
It’s fail to working with other build-in appender (e.g. 
ch.qos.logback.core.FileAppender)
Exception:
java.lang.IllegalStateException: The MDCPropertyMap has been already set for 
this event.

Regards,
Jian
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