Chunk not loading even after a minute

While playing in my world, some of the chunks stopped loading even after a few minutes of waiting for them to load. And while I typed this issue, the unloaded chunks still didn't load. I am not sure if it's the computer's problem, or the world's problem. I even tried to restart the world, and the problem still persists.

 

Also, while I was about to finish this issue, some of the unloaded chunks did actually loaded.