I currently have this symptom. I ordered extremely spicy Thai food last week. I could feel the heat, but not taste anything at all.

After about 4 days, I regained some ability to differentiate between salty/sour/sweet, but it’s been in and out for the last 2-3 days. I accidentally poured too much mustard on a sandwich at lunch today and could not have told you there was any mustard on it at all in a blind test.

I mostly ate spicy food during my time with it due to the fact the physical sensation of spiciness being one of the only things that made food interesting. Same with saltiness. I actually ate a lot less during that period due to not having much drive to do so with a lack of taste.

I could still "taste" the burning sensation, but the "flavor" (savoriness?) was gone. Hard to explain.

Not sure, I don't recall trying spicy food. I had sensation in my tongue so any physical harm I would feel no problem, just no taste.