When I enter the maximum number of characters (or slightly less) in Russian into the field name string, the game crashes with this error:
The game ended with a crash when the event handler was pressed:
Error: Input/output.Nettie.the handler.codec.EncoderException exception: The string is too large (34 bytes were encoded, 17 maximum)

At the same time, when entering English characters, there is no error.

I tested the mod on a clean, newly installed Minecraft, with forge-1.16.5-36.2.23 and here are the results:
crash-2022-01-25_17.15.58-client.txt
latest.log

I count on your help, this is one of the most important mods on my server