7DTD Linux ERROR: Shader is not supported on this GPU

[MetalStorm]

I bought this game for my son for Christmas, but upon attempting to run it I get nothing but black when getting into a game. The compass at the top of the screen is visible, as is the toolbar at the bottom, but everything else is just solid black.

I already tried changing the graphics settings from the initial recommended settings (I think it was Medium or High to the lowest settings, but it didn't change the behavior. I also did some searching and found a suggestion on reddit to try launching with "-force-d3d9" in the custom launch options but that didn't help either.

On looking in the logs, I found the following bit:

WARNING: Shader Unsupported: 'Hidden/Nature/Terrain/Utilities' - All passes removed
WARNING: Shader Did you use #pragma only_renderers and omit this platform?
ERROR: Shader Shader is not supported on this GPU (none of subshaders/fallbacks are suitable)WARNING: Shader Unsupported: 'Hidden/Nature/Terrain/Utilities' - Setting to default shader.

along with a few more errors about shaders. I figure this is probably my issue, but I've tried searching for the error message and didn't turn up any useful information, or suggestions on how to fix.

Here's the specs for the computer we're trying to run this on. I know it's not the best, but it's what we've got right now... For reference it's running Mint 20 with Cinnamon desktop.

Memory:    RAM: total: 7.77 GiB used: 2.52 GiB (32.5%) 
           Array-1: capacity: 16 GiB slots: 4 EC: None 
           Device-1: DIMM0 size: 2 GiB speed: 1333 MT/s 
           Device-2: DIMM1 size: 2 GiB speed: 1333 MT/s 
           Device-3: DIMM2 size: 2 GiB speed: 1333 MT/s 
           Device-4: DIMM3 size: 2 GiB speed: 1333 MT/s 
CPU:       Topology: Dual Core model: Intel Core i3 540 bits: 64 type: MT MCP L2 cache: 4096 KiB 
           Speed: 1463 MHz min/max: 1200/3067 MHz Core speeds (MHz): 1: 1463 2: 1442 3: 1430 4: 1463 
Graphics:  Device-1: AMD Pitcairn PRO [Radeon HD 7850 / R7 265 / R9 270 1024SP] driver: radeon v: kernel 
           Display: server: X.Org 1.20.8 driver: ati,radeon unloaded: fbdev,modesetting,vesa 
           resolution: 1920x1080~60Hz, 1920x1080~60Hz 
           OpenGL: renderer: AMD PITCAIRN (DRM 2.50.0 5.4.0-48-generic LLVM 10.0.1) 
           v: 4.5 Mesa 20.3.0-devel (git-a3543ad 2020-09-26 focal-oibaf-ppa) 

Is the graphics card in this machine too old? The 7850 in this machine seems like it should meet the minimum requirements and runs plenty of other games just fine, this is the first time encountering an issue like this.

Ant help is appreciated!

[SylenThunder]

This is because of new Unity features that haven't been implemented in the game code yet. They can be ignored.

Could we get a full log on Pastebin?

[MetalStorm]

Sorry for the delay. Here's a full log from just now: https://pastebin.com/BCWq0c4r

When I launched again today I tried it with the default settings, instead of just hitting the minimums and noticed a colored square on the ground, and a colored highlight on character arm. I took a screenshot of what I'm seeing, which I posted here: https://pasteboard.co/JHYb8Oh.png

Thanks for looking!