Language Input Switch in Launchpad

Hi everyone

I have an issue with language input switch. I use command+space for changing inputs and using only 2 languages. The problem is: when I open launchpad and start typing I cannot change the input language. The only solution is closing the launchpad, switching language input and then searching for what I was looking for. This problem started with Sierra and now is still reoccurring in High Sierra.

Is there any fix?

Thanks