Chrome OS probably counts as Linux.
I can no longer reproduce the issue, and I don't have the log any more (because I read the comment wrong). This is probably not a Minecraft bug, because it used to happen on 1.15.2 but it won't happen any more. It could also be because I moved .minecraft to .minecraftold (or something similar).
Creative mode music can play in survival mode, though, and that shouldn't happen.
It says "Spigot" server in the F3 screen. This is probably an issue with a modded server.
OS: Ubuntu 20.04
Kernel: 5.4.0-31-generic 64 bit
CPU: AMD Ryzen 3 2200G (4) @ 3.500GHz
iGPU: AMD Radeon Vega 8
Java: OpenJDK 8
Desktop Environment: GNOME
Window Manager: Mutter
RAM: 8GB, 6949MiB available
That crash was probably caused by Forge, so Mojang can't fix it.
This can happen if you are above a mineshaft. However it probably shouldn't happen when you are far above the mineshaft.
This also affects Zombie Villagers where the textures in the incorrect positions - e.g. the villager's hat contains some of its body's textures.
That can only happen if the portal frames are rotated wrongly.
Still not fixed in 20w20b
Try logging out and logging back in, making sure to use a non-demo account.