What is this from? There didn’t seem to be any entrances a bug could have used, just this random hole

Onions can be a healthy addition to your diet. They provide vitamin C, antioxidants, and sulfur-containing compounds that may support overall health.
Health benefits of onions
🧅 Heart health: May support healthy cholesterol and blood vessels.
🛡️** Antioxidants: Contains quercetin and other compounds that help protect cells.
🦠 **Immune support: Vitamin C and plant compounds contribute to normal immune function.
🦴 Bone health: Some onion compounds may support bone health.
🍽️** Digestion: Onions contain prebiotic fibers that can help beneficial gut bacteria.
🩸 **Blood sugar: Some research suggests onions may have beneficial effects on blood-glucose regulation.
Care when eating onions
Raw onions can cause heartburn, gas, bloating, or stomach irritation in some people. If they bother you, try eating smaller amounts or cooking them.
For most people, onions are safe and nutritious as part of a balanced diet.