As someone who follows Thai sports, I won't be surprise if Harnsujin fails to qualify for the Olympics as she can be inconsistent. For instance, several months after winning the world championships, she only won bronze in the 2019 South East Asian Games. Harnsujin has not done well in other tournaments like the grand prix, etc. Considering the Iranian is not a slouch and had some success in the 49 kg category, she could easily "upset" Harnsujin. Also factoring in the pandemic, Harnsujin's preparation might not be up to par.
If you follow Thailand and their performances in all sports, you would realize that Panipak Wongpattanakit is one of the country's few consistent amateur/professional athletes. Thai athletes are very inconsistent.