The QUIC multipath implementation must be updated to match draft-ietf-quic-multipath-12. Two problems…

The QUIC multipath implementation must be updated to match draft-ietf-quic-multipath-12. Two problems…: a task in LegoFlow-SWE (Harbor dataset). Both issues prevent a QUIC implementation conforming to multipath draft 12 from successfully establishing or maintaining a connection that uses multipath.