@jonahwilliams and I believe that, at least on Vulkan, we are now enabling validation errors on debug mode, i.e. debug builds of the engine. That's valuable because not only will it run in most of our unit tests, end users that run the engine in debug mode will get/log these GL errors.

This issue is to be consistent with Vulkan (and perhaps Metal), and run GL_CHECK on debug mode.

(Currently it only runs on --unopt, which AFAICT most engine developers don't actively use/isn't tested)