DX 12 mode do not work with Proton version 7.0-1 but it's ok with experimental version (experimental-7.0-20220331) and 7.0.2-rc2 (proton-7.0-2-rc2) for me.
GPU: Radeon RX 6700 XT
Driver/LLVM version: Mesa 21.3.8 LLVM 13.0.1
Kernel version: 5.17.1
proton 7.0-2x1 2022-04proton 6.3x1 2021-06VKD3D_CONFIG=dxrx1 2021-06VKD3D_CONFIG=dxr %command%x1 2021-06
Compatibility Report
System Information
I confirm:
steam-1544360.log
Symptoms
DX11 mode works fine, the default DX12 mode (which includes ray tracing) crashes with this pop-up:

Reproduction
Boot game with proton 6.3.5-rc1
Select "Play LEGO® Builder's Journey"
crash
same happens with "VKD3D_CONFIG=dxr %command%" in launch options