gap in the Notification tray

[Mechanizer22]

Just got upgraded to Nougat courtesy my new Nokia 6.
If you can see at the top left corner, there is a small gap the size of an icon. Is there an icon invisible there? I wonder is this an issue with Nougat or Nokia? Kindly help me figure out

 

[B. Diddy]

Welcome to Android Central! It could be an app that's active, but you might have selected an option to hide its notification icon. For example, this can happen with the Notification Toggle app.