Ii get the pest thing.
But it's just mag.
If you've Epsom salt.
A 250ppm feed or foliar spray will help. As if it was a pest, they attack indiscriminately. They don't say "hey guys let's attack in-between the vains to trick this guy into a mag def) but the radom marks, I do get why one would think its a pest. Idt so. Could be wrong.
It just looks like a very light mag.