Here is the solution (but needs root in some cases). It wasn't showing for me too even after updating the Contacts app. And then I found that the Contacts app on my relative's phone shows:
I realize that she had an old version. Even if I deleted all the updates, it is still older than mine (by the way, both run on Pie Android One phone). She sent me the APK of Contacts but I couldn't install it because it older version. So, I opened Titanium Backup, pressed and hold on Contacts, turned it into a user app, uninstalled it, installed the version that she sent to me, and then make it a system app again with Titanium Backup (or any alternative app that transforms a system app into a user app), and it worked really well.
Anyway, the version that shows the time of the call is 3.0.7.210756853. So you should uninstall the updates of the app (from app info, then the top-right corner, and uninstall updates).
Then, if you have a version older than 3.0.7.210756853, you don't need root or Titanium Backup or that kind of stuff. All you have to do is to download this version and install it.
But if you uninstalled the updates and it is still newer than 3.0.7.210756853, you should have root and do what I explained above.