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Finally figured out why my loops kept skipping items

Spent last Tuesday debugging a function that was supposed to process a list of 12 orders but kept dropping the 3rd one every time. Tried console.logs everywhere, checked the indexes, even rewrote the whole thing once. Then I realized the issue was I was modifying the array while looping over it, which shifted everything. Switched to a simple copy of the list and it worked on the first try after that. Has anyone else hit this same wall where the fix is way simpler than you thought it'd be?
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