[Linux] GFX FIFO unknown opcode error when playing Wind Waker randomizer with Vulkan

[KatIsntGood]

Been getting an unknown opcode error for a while when playing Wind Waker randomizer (this one here) when using a texture pack (Hypatia's). Eventually Dolphin cooperates. Currently on build 11382 and I've included as much relevant info as possible including the 3 panic handler popups. I've disabled dual core, tried enabling synchronize GPU thread. I don't get the error in OpenGL. No other game of mine seems affected

Code:

OS: Manjaro 18.1.4 Juhraya
Kernel: x86_64 Linux 5.4.6-1-MANJARO
DE: KDE 5.65.0 / Plasma 5.17.4
WM: KWin
CPU: Intel Core i5-4690K @ 4x 4.4GHz
GPU: Radeon RX 570 Series (POLARIS10, DRM 3.35.0, 5.4.6-1-MANJARO, LLVM 9.0.0)
RAM: 3237MiB / 15892MiB

Code:

GFX FIFO: Unknown Opcode (0x04 @ 0x7f217054d00e, preprocess=false).
This means one of the following:
* The emulated GPU got desynced, disabling dual core can help
* Command stream corrupted by some spurious memory bug
* This really is an unknown opcode (unlikely)
* Some other sort of bug

Code:

Illegal command 04
CPBase: 0x0041b8c0
CPEnd: 0x004bb8a0
CPHiWatermark: 0x0009c000
CPLoWatermark: 0x00050000
CPReadWriteDistance: 0x00001aa0
CPWritePointer: 0x004b7360
CPReadPointer: 0x004b58c0
CPBreakpoint: 0x00000000
bFF_GPReadEnable: true
bFF_BPEnable: false
bFF_BPInt: false
bFF_Breakpoint: false
bFF_GPLinkEnable: true
bFF_HiWatermarkInt: true
bFF_LoWatermarkInt: false

Code:

An error occurred.

 Line: 19
 File: /tmp/trizen-kat/dolphin-emu-git/src/dolphin-emu/Source/Core/VideoCommon/VertexShaderGen.cpp

Ignore and continue?