Just noticed this one yesterday. The explosions are painted on a simple mesh plane and fade out. However on my client the transparent alpha is showing up as black. I am running Manjaro (Arch Linux) fully updated Nvidia-dkms drivers, and straight Wine 10.4, no Steam, no Lutris, etc..
I have already attempted several changes to client rendering levels, from potato mode to the most extreme. I also used Manjaro’s downgrade feature to jump back a few versions of Wine starting at 9.0 and working up to 10.4 without any change to this visual.
To me this is a minor visual issue, something I can put on the back burner until next weekend, if need be. If I get this fixed, I will keep you posted on the how and why.
Are you using DirectX11 or DirectX12?
If DirectX11 you might want to look into updates for your DXVK or play with its options.
If DirectX12 you might want to look into updates for your VKD3D-PROTON or play with its options.
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Actually neither. The launcher defaults as DX11 and will not allow a choice. I don’t have Vulkan either, DXVK converts Direct3D 8/9/10/11 calls to Vulkan. I use X server and OpenGL.
But I got this issue fixed. Here is how;
I used regedit and deleted the Direct3D keys installed within the wine registry. Then I installed the prior version of Wine I was using before upgrading to 10.4. Using downgrade at the command line;
$sudo downgrade wine
loading packages...
warning: downgrading package wine (10.4-1 => 9.16-1)
resolving dependencies...
looking for conflicting packages...
Packages (1) wine-9.16-1
Total Installed Size: 591.90 MiB
Net Upgrade Size: -925.46 MiB
:: Proceed with installation? [Y/n]
(1/1) checking keys in keyring [######################] 100%
(1/1) checking package integrity [######################] 100%
(1/1) loading package files [######################] 100%
(1/1) checking for file conflicts [######################] 100%
(1/1) checking available disk space [######################] 100%
:: Running pre-transaction hooks...
(1/1) Creating Timeshift snapshot before upgrade...
==> skipping timeshift-autosnap due skipRsyncAutosnap in /etc/timeshift-autosnap.conf set to TRUE.
:: Processing package changes...
(1/1) downgrading wine [######################] 100%
:: Running post-transaction hooks...
(1/5) Registering binary formats...
(2/5) Arming ConditionNeedsUpdate...
(3/5) Updating fontconfig cache...
(4/5) Updating 32-bit fontconfig cache...
(5/5) Updating the desktop file MIME type cache...
$ wine --version
wine-9.16
Here is how those explosions look now.
Good old backwards compatibility at work. 
