Technically speaking, questions for debugging would be on-topic on Stack Overflow. However, a bit of overlap between Stack Exchange sites is not unusual, and the community over here might be able to provide some insights in the broader area of computer graphics.
So, would questions about debugging OpenGL (or OpenGL ES) be on-topic?
Debugging shaders can be quite different from "normal" debugging, and involves very unique challenges. Furthermore, someone not working with computer graphics will never encounter these issues. It's important to have these questions in this community where we have computer graphics experts to answer them, and where people seeking help with CG programming will likely try to find them.
promgrammingthat word describes my high school dance experiences. $\endgroup$