The version i was using prior to the latest update was 0.53.4 I think? Not sure about the exact build, i don't have it downloaded anymore. Newest version isn't working on my deck either and NW.JS isn't helping unfortunately. I installed via Lutris.
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Here is a link to the download folder for version 0.53. https://mega.nz/folder/BOpWkZAC#qr1nDEKoKzGJD7K6AxemQw If you are able to run version 0.53.4 from there, then you could try copying the www folder from the new version into that and seeing if that works. If version 0.53.4 no longer works, I'd have to assume something has changed for the Steam Deck, in which case I don't know what else to try unfortunately.