Hi Boris,
Well, it should, but I guess the modification might mess with that as well. There is solution to that I believe.
1. Make sure that the loading color is not the same as the background color, otherwise it is not visible: https://i.imgur.com/UWblXUB.png
2. You can also enable the loading indicator to display in the results box as well: https://i.imgur.com/ghKa6UG.png
These should hopefully help.