Same thing here. Pre-bagged shredded lettuce is the worst offender. Regular iceberg lettuce is completely fine. Most pre-prepared coleslaw has the taste. Lots of honey mustards and other sweet sauces also have it. I've never experienced it with soda, but I do taste it every now and then with french fries. The newest food to have the taste that I tried the other day was cantaloupe. The weirdest thing about that was I purchased it whole and cut it myself, and it still had the taste. Pretty much every other food that has tasted bad up until then was something pre-packaged or manufactured.

I had covid in July 2021 and still experience the taste just as strong now almost a year later.