Preserve claims verification state for unencoded payloads

Author: OskarEichler

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 **Fixes and enhancements:**
 
+- Preserve claims verification state when decoding unencoded payloads [#753](https://github.com/jwt/ruby-jwt/pull/753) - [@OskarEichler](https://github.com/OskarEichler)
 - Fix rejection of unknown algorithms from JWKs for RFC compliance and pquip [#728](https://github.com/jwt/ruby-jwt/pull/728)
 - Fix the `Style/DirectiveScope` RuboCop offense failing the build [#752](https://github.com/jwt/ruby-jwt/pull/752)
 

lib/jwt/encoded_token.rb

@@ -190,7 +190,7 @@ def decode_payload
       raise JWT::DecodeError, 'Encoded payload is empty' if encoded_payload == ''
 
       if unencoded_payload?
-        verify_claims!(crit: ['b64'])
+        Claims::Crit.new(expected_crits: ['b64']).verify!(context: ClaimsContext.new(self))
         return parse_unencoded(encoded_payload)
       end