Tomatoes will react to metal. I cooked some sauce in a metal pan and it ate through and left it shiny under the sauce level to the shiny metal. So fast. Weirdest thing I ever saw. Threw the pan out immediately. I learned years ago that tomato juice tastes tastes like the can if it’s canned so buy it bottled in plastic now.
I haven’t had any problems with canned tomoates but I’ve recently started buying tomato sauce in the new paper cartons like some chicken broth comes in. Of course, the boxes aren’t as sturdy or probably not as long a shelf life due to leaks but the paper is coated with a wax.
As Sarajevo said, canning your own in glass jars would eliminate the reaction problem. However, I’ve seen older jars of anything containing an acid will begin to pit and discolor the lids. Fruit juices and jellies will do this. Remember, tomatoes are fruit.
“Remember, tomatoes are fruit”.
Knowledge is knowing that a tomato is a fruit; wisdom is knowing not to put it in a fruit salad.