On my PaperMC SMP server, I am noticing an alarming amount of instances where opening a shipwreck or underwater ruins treasure chest generates a blank treasure map. The result is either severe server lag, timeout issues, or complete disconnect of everyone logged on at the time. I have made sure this is not a mod/plugin issue by removing all mods/plugins to recreate the error. The error messages that pop up in the console are prefaced with a statement that 'this is not a bug or crash within Paper'.
Linked issues
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https://pastebin.com/wXjWWvxJ