It’s highly likely that the production of iPhone-9 might be hampered in China due to Coronavirus, as the situation seems to be aggravating.
Apple forecasts faster sales growth, strong iPhone demand despite glum economy
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Apple September 12 Event: iPhone 15 Charging Port Change to USB-C From Lightning - Bloomberg
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Apple Issues Coronavirus Update As Insider Paints Dark Picture For iPhone Supplies
COVID-19 Coronavirus: Impact on Apple's iPhone, Mac and WWDC - MacRumors
Apple warns coronavirus will hurt iPhone supplies
Apple's iPhone plant in China, run by Foxconn, hit with Covid outbreak