Out of the blue, my Minecraft starts to display these odd white lines, that almost seem like the Wither shield, across my screen. There's also random colored "noise" all over it, almost like dead pixels. This happened shortly after joining my Realm post-1.14 update.

I'd like to be able to post some form of steps-to-repro, but quite frankly I don't know how or why this happened to me to start. It happens in every perspective, and doesn't go away on death. Leaving and rejoining doesn't help either. It also does not go over any GUI, and happens in any gamemode.

Edit:// I'm willing to mark this closed since it randomly fixed itself today, and therefore can't help in fixing a problem that no longer exists. I hope, however, that this is something that will have an eye out for, since it was very odd and random.

Edit Apr 28:// The issue has returned. An updated image is below, next to the other. I should point out that no errors occur in the launcher when this happens.

Edit Apr 28 (2):// After copying /home/$USER/.minecraft to another folder (/home/$USER/.minecraft\ copy), and running a second account on the same Realm, I've confirmed that it seems to only be that one instance of Minecraft.