When loading into a world with RTX raytracing enabled all banners are automatically rendered with a black and purple background. This issue spans across all resource packs enabling RTX and has been commonly identified by the community as an issue with Minecraft's RTX rendering. A more stable form of this bug existed prior to the current version of the game, and resulted in the banner rendering the base color of the banner with only the patterns missing.

How to Reproduce:

1. Activate RTX/raytracing for a world
2. Place a banner

I know this issue has been around for many years. I understand the development team is busy working away on issues that actually affect the majority of MC players (rather than fixing a seemingly minor texture that at most affects half a percentage of overall Bedrock players). Still, I plead with the team behind this fantastic game to perhaps look into fixing this problem once again. I have a faction world, which is obviously littered with all kinds of banners, and I find it absolutely saddening not to be able to see this world in the beauty that RTX offers and take advantage of all the hard work put into the development of RTX because it betrays the very integrity of many of the builds. And yes, I am very aware that I am but yet one person out of hundreds of millions who love this game. Due to that, this post most certainly will not be noticed, but the small chance that it does gives me hope, and I know that if, by some miracle, this issue is fixed, the entire RTX community will be very much grateful. 

https://drive.google.com/file/d/1DV_b2ZOfwKiI2cwjlXVrujo2PVc2nucz/view?usp=drive_link