Body parts are scrambled when changing cape

I was messing around with the RTX beta on a singleplayer world when I noticed that my elytra was flashing colors. I thought that this was because of the cape I was wearing, but when I changed my cape, my body parts were scrambled and the elytra was still flashing. 

 

Note: It won't let me upload the video I have of this, so here's a [mediafire link|https://www.mediafire.com/file/e19lx616u09im1f/Minecraft_2020.06.05_-_18.39.11.02.mp4/file]

 

Also, STROBE WARNING, the video contains a flashing elytra.