These are viruses specific for alliums going by the generic name of yellow dwarf viruses. They look streaky, but not just at drying, but pretty much after 15 cm they started looking worse and worse. The streaks are also not continuous, like on those ornamental plants for example, which would likely indicate some deficiency.
We have some thrips, I'm pretty sure those could spread things around no problem, and it's compatible with onions. I was reading a paper that said a lot of the garlic we have is actually infected with one virus, but visible symptoms are not there yet.
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