Don't know why it would be bad. I have punch bait in the garage that's 2 yrs old, still stinks and works fine, lol. It gets pretty warm in the garage too. If anything, it might be a little soft if it's still hot but nothing a little time in the cooler can't fix.
My punch bait sets in the boat all the time. The night before I go, I will place in my ice chest and put some ice in it to help thicken back up. I stir it first to get the good stuff mixed back in.
Cattails are great to thicken up. Plus it helps with holding the bait on the hook much better. Use to be a guy who made his with cattails. But he and his wife got a divorce and the judge made them split the recipe. He didn't get the cattail part and she won't sale him that part of the recipe. Sez it serves him right for getting the boat.
2 Corinthians 5:7 For we walk by faith not by sight.