tab(⇥) button in Xcode 12.4 doesn't work

I've faced some really weird problem in Xcode. In one of my projects in some specific git branch, when I tap 'tab'(⇥) button it doesn't work. In other projects or another git brach of the project it works fine.

What I tried:
  • Restarted xcode

  • Restarted Macbook

  • Cleaned derived data

  • Cleaned build folder

  • Deleted project and cloned it again from remote repository

  • Deleted xcode and reinstalled it again

  • Updated xcproject to recommended settings

Nothing has helped.

I also had Xcode 11 installed. And it was crashing, when I pressed tab button in the project in that branch. I deleted it and it also didn't helper

My suppose is I've broken some project settings during merge and solving conflicts, that somehow affected tab button behaviour.

I don't know where to start research to fix it. Any help would be really appreciated.

tab(⇥) button in Xcode 12.4 doesn't work
 
 
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