maybe you've broken that bit when moving the plant / watering?
The leaf looks perfectly fine, which suggests it didn't cause much harm / stress
I've had similar bites in my leaves and they were all due to physical contact
Have you got some kinda magnification to look at close up and see if edges have some kind of pattern to them or are they randomly ragged, there looks like a white edge to the early damaged sites and it near the same areas on the leaves. strange indeed. regards
I have some of the same on mine. I decided it's prob low humidity. Or me misting the plants during lights on. Cause I have a good scope and I have zero bugs.
Freedom becomes non-existent if nature is illegal.