I 've been playing minecraft bedrock using the steam deck, over LAN with my daughter on the Windows PC. We needed two Minecraft accounts $29 from Microsoft. The deck controls worked identical to Xbox controller once I loaded the Minecraft bedrock launcher from the discover app and added it as a non steam game to game mode. That was the key to get the controller to behave right. It all works like a dream now and is super fun!
Done and done! Big SC2 fan. Now I’m just waiting on my swag :)