[17:05:49] [Server thread/WARN] [ne.me.su.Supplementaries/]: failed to parse config 'custom_adventurer_maps' ([]): expected 9 entries, found1

Just wanted to check if this is harmless!

yes almost everything that's under "warn" is usually harmless. When something bad goes wrong it's usually good practice to let the game crash. I put that message in when it failed to parse some optional configs for stuff that isn't even totally added in yet

Understood! I know warns are usually harmless, I just like to report them in case they are actually resolvable (even -0.1% overhead is still less overhead!).