GitHub user paladox added a comment to the discussion: Help with migrating from 
log4j to log4j2 (we also use a slf4j -> log4j)

I think I may have figured it out. It's due to 
`rootConfig.addAppender(consoleAppender, Level.ERROR, null);`. Setting the 2nd 
param to null fixed it.

GitHub link: 
https://github.com/apache/logging-log4j2/discussions/3914#discussioncomment-14307352

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