Does fasting become invalid if one burps and a piece of food rises to the mouth and is swallowed intentionally?

Question:
The questioner says: After the Fajr prayer, while I was fasting, I burped and a piece of food rose to my mouth. I burped. Yes. I burped and a piece of food rose to my mouth, and I swallowed it intentionally. Did my fast become invalid because of that?

Answer:
If you were ignorant or forgot that you were fasting, there is no harm; it does not affect your fast. However, if you knew that this is not permissible for you, knowing that it is not permissible for you to swallow it once it has reached your mouth—if the burp brought it to your mouth, it is not permissible for you to swallow it. If you swallowed it intentionally, your fast is invalid.
Because this is equivalent to eating and drinking. However, if it did not reach your mouth and was still in the throat, this does not affect your fast. Or if it reached your mouth and you swallowed it while forgetting, or swallowed it out of ignorance of the ruling, or swallowed it without your choice, against your will, this does not affect your fast.