SSL_set_ssl_method vs SSL_CTX_set_ssl_version ( NTLS_server_method())

[vk2705]

i try to set method of SSL* object to NTLS. if I do SSL_set_ssl_method(con, NTLS_server_method()); connection by fails with error 140309886080768:error:1420909F:SSL routines:func(521):reason(159):ssl/statem_ntls/statem_srvr.c:1063:

• The connection was TLS Client Hello with supported versions ext inc. GMSSL

if I do
SSL_CTX_set_ssl_version(ctx, NTLS_server_method() ); con = SSL_new(ctx)) , then it works ok - the connection is established with NTLS method.

I think there is a problem with SSL_set_ssl_method() function... what is your opinion? thanks!