Section 3.1:
"Opening a new path requires the use of a new connection ID (see Section 9.5 of [QUIC-TRANSPORT])."
I think the mentioning of "new connection ID" here is pointing to the wrong thing. Isn't what is most important here is to use a new CID for the next path ID. And here to my understanding the next Path ID is the lowest value not yet used for any path challenge and which is not currently in use on any path challenge for another 4-tuple.
Section 3.1: "Opening a new path requires the use of a new connection ID (see Section 9.5 of [QUIC-TRANSPORT])."
I think the mentioning of "new connection ID" here is pointing to the wrong thing. Isn't what is most important here is to use a new CID for the next path ID. And here to my understanding the next Path ID is the lowest value not yet used for any path challenge and which is not currently in use on any path challenge for another 4-tuple.