That’s not even sabotage; that’s just CYA so your workload is documented. If it isn’t visible in your issue tracking system, your manager has no way of quantifying that you’re getting dragged into that work above and beyond your normal “day” job. In a perfect world (read: after capitalism is dragged out back and beaten to death with a baseball bat covered in rusty nails), this would affect budgeting and staffing requirements estimates. In late-stage capitalist hellworld, it’s more of a measure of how over-exploited you are, but can work in your favor for at least not getting dinged on performance reviews.