Hello Again Mattia,
I have successfully imported your ClientHello into wireshark. It looks to be a compliant TLS 1.3 client hello handshake message. I see no problems with it. But then the server sends a DECODE_ERROR alert message. Can you please confirm that the server received the same client hello that you pasted above? I suspect that there is some sort of I/O mishap here.
Warm regards, Anthony