[Path Target] Mismatch between specification and implementation

[yonid-mlnx]

in section 2.2.2.1 of the specification it says that "When set in the prefix in a request, GetRequest, SetRequest or SubscribeRequest, the field MUST be reflected in the prefix of the corresponding GetResponse, SetResponse or SubscribeResponse by a server" HOWEVER looking at lines 273-276 of subscribe.go it seems we will only add target if it exists in the cache. Is this a bug?