No, nothing bad, but it could have been.
Like many here, I have found ammo getting very hard to come by, and components for reloading. But when it comes to my CARRY ammo, I have to, per Dept order, carry only new factory ammo, not my own handloads. So, my round of choice has been the 135gr Hornaday +P Critical Duty. I generally changed out my carry ammo once every six months. Then, the plandemic and the triple panic buying fiasco hit.
Fast forward a year and a half to this morning. I FINALLY found some of my chosen self defense ammo, (the price was, shall we say, not nice), and I swapped out the carry magazine, no problem. The SPARE...THAT was interesting as that ammo had been in there for quite some time and they were actually literally covered in lint. Carried upside down in an OWB carrier, but under a concealing t-shirt most of the time, and they got linty as all get out. I wonder if it would have had any effect of feed and function, but I was very happy to not have to find out!
Look well, o wolves, and learn from my mistake! Check that ammo in your spare mags!