Aircraft structural engineer here.
Every airplane you’ve ever flown on or ever will fly on has cracks in the structure all over the place. It’s very very common. And to add insult to injury, if an exterior crack or hole is found that could compromise the integrity of some non critical area like the leading edge of the vertical stabilizer or some piece of engine housing, the standard procedure is to just put some fancy duct tape over it until they can get it in a maintenance hanger.
Oh and also in my personal experience every aircraft is also probably missing about 20 or so fasteners or screws without anyone knowing.
(But on the bright side so nobody freaks out, aircraft are also commonly way over engineered with several backup structures so no one failure can down a plane without another failure somewhere else.)