Notice: Connection doesn't allow setting of receive buffer size

[d47081]

By running with systemd unit I have this notice in error log:

connection doesn't allow setting of receive buffer size. Not a *net.UDPConn?. See https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes for details.

What is this means in simple words?

p.s. I don't use quic just tls peer on launch

Thanks