This issue is supertechnical and needs to be given to a zwave engineer who understands zwave multichannel association. But I have seen it reported for several different devices now, so it definitely needs a fix.
When a multiendpoint zwave device (typically a multi button light switch) uses association to communicate with the hub, the hub’s device ID needs to be added to each association group used by the device, or the button presses for that device will not get sent to the hub.
There have been several devices using the stock drivers where users report the last button doesn’t work. Meaning its button presses aren’t being sent to the hub. Here’s one recent example with a stock edge driver. Buttons 1-3 work, button 4 doesn’t.