Okay, here is the answer: delete this file—it's the cause of the problem—and everything will work again.

Option 2

Install Better BuildBuy, as it overwrites and redesigns the game's filter, and use the corresponding patch.

To verify that it is installed correctly, it should look like this in your mods folder.

Either of these two options will solve the problem.

I want to emphasize that this is a temporary solution; I am already working on the update, but I have several other things to upload.