SIWE shows up as Unknown Signature Type

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Why isn't this being recognized as a SIWE message? "Unknown Signature Type"

Im using the main library for it https://github.com/spruceid/siwe/blob/main/packages/siwe/lib/client.ts so I beleive all the formatting is correct

Reproduction steps:

1. Visit any popular site that uses SIWE (e.g. press "Connect Wallet" on the WalletConnect Dashboard)
2. When trying to sign in, it will show "Unknown Signature Type"