Line 2581 Table 3-10 - Subscribe Reason Codes
Reason Code 145 (0x91) is a in response to the entire SUBSCRIBE packet, and not for individual topic filter. We need to allow in the spec to send this one independent of the list of Reason Codes. I suggest we allow one or more return codes in lines 2577-2579. The Server may send only 145 or a list of Reason Codes containing one return code per topic filter.
This issue was originally reported in MQTT-417, which doesn't seem to be applied in WD14.