I experience a very similar if not the same issue.
Whenever I enter a Gamardan scene, the entire window displays visual glitches and artifacts in the form of white flickers and lines rendering the game unplayable when using the Gamardan map. I've seen similar reports regarding this same issue reported here and on the Steam forums, and it seems to affect Gamardan especially. The same problem occurs in both the campaign and custom battle modes.
I've tried entering the Gamardan scene during different times of day and during different seasons. Removing shaders avails nothing. I've also tried tinkering with graphical settings and drivers. All to no avail.
This problem is occurring on the current release and on beta releases 1.0.3 and 1.1.0. Specs are Windows 11 as well as Void Linux x86_64, AMD RX 580 with 4 GB of VRAM, AMD Ryzen 5 3600, and with 32 GB of DDR4 RAM. Graphical settings are all set to their maximum values by default.
