Every line in this log has "inecraftFormatting" stuck on the end
What it looks like in your log
Starting minecraft server version 1.21.1inecraftFormatting
What causes it
The logging pattern uses the %minecraftFormatting converter, which only exists on Paper. Anywhere else log4j cannot resolve the name, falls back to the plain %m message converter, swallows the options written after it and prints the leftover characters of the name as literal text. So each line gains a trailing "inecraftFormatting", and because the colour-stripping option was swallowed with it, section-sign colour codes survive into the file as well.
How to fix it
The server is fine; the log is being written badly. In the log4j2 configuration, replace the %minecraftFormatting converter with log4j's own %replace converter to strip section-sign colour codes, or stop applying a Paper logging configuration to a server that is not Paper. Until then anything reading these lines, chat relays and log parsers included, is reading corrupted text.
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