Match Timeline Not Appearing In-Game

The Match Timeline is not appearing when I press my hotkey. I have found this happens when I do not play a normal game to start. For example, if my first match after logging on is Deathmatch or Spike Rush, it will never load in-game until I restart my client.

Hey, I tried to reproduce it and it worked well for me. I tried deathmatch first, then a competitive match, and it worked.
Are you sure that your hotkey for that timeline is tab?