An object returned from SSL_accept_connection() may not have completed its handshake. It should be perfectly ok to call SSL_accept on such an object. If you do this then you get an error response and an error is raised on the error stack "should not have been called".

By contrast it works as expected if you call SSL_do_handshake() instead of SSL_accept.

In particular this looks wrong:

I might have expected:

 IMPLEMENT_quic_meth_func(OSSL_QUIC_ANY_VERSION, 
                          OSSL_QUIC_server_method, 
                          ossl_quic_accept, 
                          ssl_undefined_function, ssl3_undef_enc_method)