Sometimes telnet is flooded with warnings or errors and may stop logging at all until someone does tfm reload. I decided to open this thread to keep track of when this happens for no apparent reason.
Today the following line has been repeated \~150 times before getting no more logs:
:[20:31:53 WARN]: com.mojang.brigadier.exceptions.CommandSyntaxException: Unknown block type 'minecraft:cocoa_beans' at position 0: <--[HERE]