I have put this in my grow journal, but not really had any input. I have two plants in identical soil, identical light and all other conditions. One has normal leaves, one has yellow verigations, but not the brown spots I see in other posts.
The plant seems healthy otherwise and is outgrowing all others in the tent.
Looks like harmless variegation. It is supposedly caused by a type of virus but is not “contagious”. I get it from time to time although not as severe looking. This plant outgrew it and finished fine.
It is desirable in some foliage type plants like English Ivy. This plant is called “Devil’s Backbone” due to it looks like a very crooked spine. It normally has the variegation to the extreme. Sometimes the variegation is not present and it makes for a dull. ordinary looking plant.
I think too that it is genetic or viral variegation. From my years growing other plants, It looks like hwo the plant wants to grow and it certainly is growing fast and hardy.