I just discovered that I have this same problem in a project I am working on. It has been driving me crazy trying to figure out where the warning was coming from and when I commented out the call to dismiss() it finally disappeared. Very annoying.
FlyOstrich
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Same issue for me updating to XCode 14.0 through the app store.
MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports)
Processor: 2.3 GHz Quad-Core Intel Core i7
Memory: 32 GB 3733 MHz LPDDR4X
1.34 TB of free disk space
I've made it up to Completed: 943 of 1000 now after several hours already and there is no way to stop the installation in the app store. Just a spinning progress wheel with nothing happening when I click it.