Here's what the MOTD normally looks like in vanilla:

While this is what the MOTD looks like with Legacy4J:

The MOTDs with Legacy4J looks fine on most servers, but MCC Island's MOTD doesn't look great because it's missing the entire MOTD, while for Hideaway it's missing the light gray-coloured "1.20.1" part.

It wasn't necessarily a bug, but rather the fact that MOTD wasn't made for a button with a smaller width, anyway this was fixed in version 1.5, thanks for reporting.