Unfortunately, this issue IS related to the Config.json file, but removing it won't help, as the issue is a problem that happens during the creation of the Config.json file.
We are actively looking into a solution to this on our end to prevent the bug, but we have a short-term fix for it for now.
In your config.json file, there may or may not be a line between "WaveQuality" and "MouseColor" for 4k Support.
If there is no such line, then you want to add it as shown in the picture below, and make sure it is set to false. If there is a line, it almost certainly says "true", and you will want to change it to false. This should allow your game to launch correctly in the interim.
View attachment 167036