These were originally reported in MQTT-417, but do not seem to be addressed in WD14.

Lines 2436-2437:

"The Topic Filter in the new Subscription will be identical to that in the previous Subscription, although its maximum QoS value could be different."

Instead:

"The Topic Filter in the new Subscription will be identical to that in the previous Subscription, although its Subscription Options could be different."

Lines 2437-2439:

"If the Retain Handling option is 0, any existing retained messages matching the Topic Filter MUST be re-sent, but the flow of publications MUST NOT be interrupted [MQTT-3.8.4-4]."

I’m not sure I understand what “but the flow of publications MUST NOT be interrupted” means. I guess other readers might have the same issue. Can this be developed further?