Internal Exception error instead of "You are not white-listed on this server" if not whitelisted and try joining a server

If you try to join a 1.20.2 server where you are not whitelisted, you get message "You are not white-listed on this server!"

On 23w40a-41a, that message doesn't appear and instead

Internal Exception: io.netty.handler.codec.DecoderException: java.io.IOException: Packet login/0 (aeh) was larger
than I expected, found 43 bytes extra whilst reading packet 0

is displayed.

Reproduction Steps

1. Start a 23w41a server (after agreeing to EULA)
2. Stop the server and change server.properties whitelist value to true and start it again
3. Connect to the server

You are shown an Internal Exception message.

"You are not white-listed on this server!" does still show up in the server log.