Erro apresentado usando Arch Linux com KDE Plasma Wayland:

click icon and run. nothing happen. run it on the terminal, get some error message about "font".
"unable to load font "server:fixed"

sudo pikaur -Sy putty

Correção do erro:

1. then do some setting in putty's GUI:
2. session → “ONE SESSION” → load
3. connection → SSH → X11 → Enable X11 forwarding
4. windows → fonts → font used for ordinary text → change… → select one font that can preview
5. session → save

OK!

Fonte: https://github-wiki-see.page/m/architectcom/-/wiki/ubuntu-22.04-install-putty%2C-with-error-message-%3A-%22unable-to-load-font-%22server%3Afixed%22