Of course, I'll be here to help as much as I can, I love Mount & Blade.
I saw the patch notes and tested the chat again, I don't crash or freeze on long messages anymore, however, there seems to be another issue.
When you hit the limit after typing a long message, you are stuck from typing again even if you reopen the chat or rejoin the server, you have to restart the game.
You can hear me mashing the keyboard after I test the chat limit in the video and nothing inputs.