Unable to connect to 1.20.1 server with 1.20.2

Trying to get a paper server i help run set up for 1.20.2. The server itself is behind a waterfall proxy. I updated waterfall and ViaVersion/ViaBackwards just a few minutes ago to the newest versions. ViaVersion is set to allow any client 1.20 or higher to connect. When I try to connect I'm getting the attached screenshot. Waterfall console just shows me connecting and disconnecting so its not too helpful.

I originally tried the Prism launcher since thats what I use - but just for testing, the screenshot attached comes from the vanilla launcher with no mods installed at all. Just a clean instance of 1.20.2.

Any help would be appreciated so I can get the users connect on 1.20.2, sicne not everyone uses mods anyway.

EDIT: just for references sake - Waterfall is on build 539, ViaVersion and ViaBackwards are on version 4.8.0, and the servers themselves are on Pufferfish 1.20.1 i think one version behind.

On the actual servers themselves, I just see a quick connect and disonnect on the console - nothing useful
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