Changing an active connection applies the changes onto the NetworkManager connection, but not on the device. This is because NetworkManager clones the connection when it is applied on a device. This behavior is expected and documented in the NetworkManager documentation [1]. To effectively apply the connection changes onto a device, a reapply operation must be performed. This will make NetworkManager apply the new connection onto the active device without having to disable and re-enable the device.
Perform this reapply operation when the Apply button is pressed in the Connection Editor so the changes effectively propagate to the network device.
Fixes #2316 (closed)