[2020] Missing rewards for Galactic Challenges tier 6

Had anyone come across a situation where the game didn't award you with the rewards for completing a tier for the first time?

I initially made a few attempts at tier6 that ended with defeat. After a while, I finally managed to get the kills in time and defeated the night sister squad with a full rebel team. But the game skipped over the 1st time Reward screen and only awarded me with rewards for completing the "Rebels" and "flawless" feats. I never received the 1st time completion rewards.

I'm on the Google Pixel 2 XL, Android: 11.