Didn't know where else to go with this. But since the implementing of the new loading screen, my ranked border is not showing anymore. I'm talking about the border I earned for getting silver/gold (in my case) last season.
I checked multiple queues: Aram, vs. AI, Ranked flex, but in none of these game modes the border shows. I am certain I got it, since it did show before the implementing of this new loading screen.
EDIT: After I got some clarification, I checked it out in a custom match. In this loading screen, my ranked banner (gold, last season) did display. However, my current border (silver, this season) did not show at all.