The problem is still there, unfortunately. As a work around, I explained the problem to it, and I asked it to replace the dollar sign $ with #, so that I can replace it back easily, and it avoids the problem of rendering. It worked for me!
here is the exact prompt:
“Since there is an issue in ChatGPT Canvas with rendering the math, I want you to keep the math written in a latex form with out rendering it. furthermore, since I want to copy it later back to a latex IDE, I want you to keep the dollar signs. you have the permission to replace the $ with #, so that you can avoid the rendering problems and I can easilly replace it back.
For big equations, you should write them inside \begin{equation} , and possibly also \begin{aligned} environments.”