The boiling water inside the rice cooker mixes with the starch in the rice to form foamy bubbles. These bubbles spill over once they reach the top of the rice cooker. This is quite normal, and there is nothing to worry about.
Basmati has a different flavor profile, nutty and slightly herbaceous. iambluest. Yes, it does. Absolutely! it is supposed to smell musty before cooking. That fragrance will be replaced by a different, more intense aroma after cooking. juliem122.

Adding the right kind of fat or oil to your rice cooker is important in order to prevent it from bubbling over. Frothy foam will form if too much air is allowed to circulate, and this can cause the rice to overflow. Adding a small amount of oil will help keep the mixture under control and stop it from bubbling over.

Is rice supposed to foam? Starch Content Just like beans, rice forms a head of foam as the starches build volume in boiling water. Some types of rice are starchier than others, particularly those high in amylopectin. As a general rule, long-grain rice such as basmati produces less foam than medium- or short-grain varieties, such as jasmine.
Add a few drops of oil/butter to the rice and you will be less likely to have the boil overs. Also washing the rice before cooking will help remove. The excess starch from the uncooked rice. It is this starch that helps form bubbles when cooking, the oil destabilizes the starch keeping bubble formation to a minimum. 1.
3. Let The Rice Toast. Ok, so you’ve sautéed your veggie and meat ingredients until they're seared and slightly caramelized. Now it’s time to add the rice. Here’s where the most important
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is rice supposed to bubble