When patching multiple devices to a single channel one item at a time, why does the console automatically create new parts when patching dimmers but not with any other type of device?

This is especially annoying when patching non-dims, which are physically the same as dimmers in my space. This has caused me to unintentionally remove power from devices that were already on when patching additional non-dims into an active channel. Weirdly, if Part 1 is already patched as a dimmer, you can add any type of device you want without specifying a new part and the console will automatically create it. On the other hand, if the device in Part 1 is anything other than a dimmer, even trying to patch a new dimmer to the channel without specifying a part will over-write Part 1, regardless of whether or not the "Replace" soft key has been pressed. So my question is, is this normal? Shouldn't the console auto-create new parts for each additional item, regardless of what type of device is in Part 1?

(Using a Gio with v3.1.5.8)

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