This is behavior for a single device, whether a device firmware bug or an issue on the Hubitat side I can’t say. But that isn’t an example of a feature being removed.
In fact, you’ll notice I commented multiple times in that thread.
Here are two.
Here’s another where staff mentioned looking into it as a bug.
Like I said, I’ve joined multiple device, utilizing no security and the skip button successfully over the last couple of months. In fact, I just joined a zen26 last weekend without security. So pretty good sign the feature still exists.
My goal isn’t to argue with you, you are stating something that isn’t accurate and I just want to correct that for anyone who might read this thread.