I have the same issue. Xcode 26.1.1 (17B100). Tahoe 26.1. Cannot build my apps at all.

Found a fix / workaround. Changed my enum raw type from Int to String. // doesn't work: enum MyType: Int, AppEnum // works: enum MyType: String, AppEnum

Also looking for a solution to this. This bug goes against Apple's own guidelines for dynamic island. Also if you notice, it expands on both sides :(

It would be really nice if this can get fixed.