Then you may want to read this. https://forums.collectors.com/discussion/1021864/anacs-my-method-of-cracking-slab-open
I did the same with my Morgans...sadly I changed my mind towards the end and now getting them re-slabbed. I think once it was set that the mint was going to do the 2021 Morgans that I thought there would be an onslaught on new collectors and maybe more counterfeits.
I have not experienced that problem. Might occur due to environment such as dry heat, moisture, fluctuating temperature, or? Just my opinion.