October now and I am still having the same issue :(
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I have had similar problems when moving to macOS 15 (for a Mac app).
The issues seem to have been resolved in macOS 15.1 beta 5.
I am seeing the same think, and am running Xcode 13.2 Beta.
Still does it with Xcode 13 Beta 4 :(
Same issue upgrading 11.2 Beta :( Stuck preparing for upgrade at 15 minutes.
This happened with me. The project was named (by me) DeleteSoon. When running, it was looking for model file DeleteSoon.xcdatamodeld, but the model file created by Xcode was name Shared.xcdatamodeld. Changed the name from Shared to DeleteSoon and it now runs ok.
I am seeing very similar results but without catalyst. I have similar mac and iOS apps - created separately and not using Catalyst. If I make changes on the iPad, they appear almost immediately on the iPhone but take several minutes to appear on the mac. Changes made on the mac appear on the iOS devices in seconds.Did you ever make any progress with this?
I tried the idea of adding a bool to each entity and toggling it, resulting in it getting written to CloudKit. This would work ok if the 2nd device started with no entities. In my case, the 2 devices each start with the same entities (via an earlier sync using a different method - dropbox). The result is then duplication of all of the entities as each device causes all of the entities to get written to CloudKit.