liteclient/connection.go
In sendAuthComplete, two consecutive binary. LittleEndian.PutUint32 calls both write to the same 4 bytes of payload. The first write (magicTcpAuthentificationComplete) is immediately overwritten by the second (magicPubKey), so the authentication complete message is sent with the wrong magic type prefix.
liteclient/connection.go
In sendAuthComplete, two consecutive binary. LittleEndian.PutUint32 calls both write to the same 4 bytes of payload. The first write (magicTcpAuthentificationComplete) is immediately overwritten by the second (magicPubKey), so the authentication complete message is sent with the wrong magic type prefix.