Git - get rid of an unreachable commit

I am trying to clean up my repository and remove all unreachable ones.

I did

git reflog expire --expire=now --all
git fsck --full --unreachable
git repack -A -d
git gc --aggressive --prune=now

      

        
        
        
      

    

But I still have some commits unreachable from my understanding, but not git

I have a commit, say A

git branch --all --contains A
git tag --contains A

      

        
        
        
      

    

return nothing

but

git fsck --full --unreachable

      

        
        
        
      

    

also doesn't return anything, so it doesn't treat A as unreachable.

What am I missing?