Demon's Souls [BLES00932] freezes but music and ambience continue playing

After playing for a few minutes (up to maybe half an hour) Demon's Souls will hang (world, graphics, interface stops), but the music and ambient sounds will continue playing. At this point rpcs3 itself is not frozen, and I can end the emulation via its menus. Resizing the window doesn't resize the contents (https://prnt.sc/ousw24). In the attached log, less than two minutes passed before it froze and I hit Stop.

OS: Windows 10
CPU: i7-8086K, stable (tested with 12h+ Prime95)
RAM: 16Gb
GPU: Gigabyte 1080 (436.02)
Renderer: Vulkan
rpcs3: Tested various but current one is 0.0.6-8574-eed32cf3 (8603 did not seem to boot the game)

CPU settings: https://prnt.sc/owpaqh
GPU settings: https://prnt.sc/owpaty

Everything is at defaults except for Write Color Buffers. Multithreaded RSX is disabled. I've tried with Preferred SPU Threads: 2 and gotten the same results.

SPU decoders: it happens with ASMJIT, LLVM and Interpreter (fast). (Precise interpreter too slow to reliably test.)
PPU decoders: it happens with the LLVM recompiler but from what I could tell not with Interpreter (fast). (as above)

This is with a clean environment, no old caches from older versions. It happens with both with and without the 60 fps patch.

(Mods: if this doesn't get approved, please let me know what's missing so I can fix and resubmit it)

edit: attachment