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I use Spotlight Search frequently to launch apps on my Mac, and it works perfectly. I use Telegram Desktop frequently by typing a few letters in Spotlight Search. I just type a few letters and tap enter and it opens. Simple as that.
However, today it started not finding it. Instead, it shows this:
The app is there, launches perfectly manually from Applications folder:
But in Spotlight Search, it's not being suggested. I've got Applications option ticked in Spotlight options from System Preferences (though I haven't touched it anyway) and it suggests other apps from the Applications folder with no problem. I am on macOS 10.12.6.
How can I fix this problem?