This is not your same problem but about 4 years ago our area was hit by a new pest of onions, garlic and leeks. It is called the Alium Leaf Miner and it is a small fly that lays eggs on Aliums. They develop into maggots aka worms inside of the leaves and they work their way into the bulbs.
After decades of onions being a care free crop, I quit growing them.
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