Do you remember the color-coded network icons? They had red Xs or yellow !s indicating problems with network connectivity.
In 1903 these have been replaced with a single icon that doesn't have the highlighting colors.
New disconnected network icon on Windows 10 taskbar
Windows 10 1903 will replace the disconnected network icon on Windows 10 taskbar. Not connected icon will appear for all types of networks whether it is WiFi, Cellular, or Ethernet. This new visual should help you quickly recognize network problems so that you can take action to resolve them. You used to see either a red cross or yellow exclamation mark for the same till Windows 10 version 1809.Seems like a step backward to me.