String Catalogs auto-generated symbols located in Swift Packages with default Main Actor isolation don't compile with Xcode 26.4

Hello,

I've already reported this issue via Feedback Assistant a month ago (FB22340897) but it's still open and I'd like to know whether I can expect something to be changed regarding it. Here are the details:

It seems that Xcode 26.4 started specifying nonisolated for the resourceBundleDescription in the generated stringSymbols files for Swift packages:

from:

private let resourceBundleDescription = LocalizedStringResource.BundleDescription.atURL(resourceBundle.bundleURL)

to:

private nonisolated let resourceBundleDescription = LocalizedStringResource.BundleDescription.atURL(resourceBundle.bundleURL)

This causes a compilation error:

Main actor-isolated default value in a nonisolated context 

when the Package.swift for the Swift Package in which the string catalog is located specifies:

swiftSettings: [.defaultIsolation(MainActor.self)]

Since all tools (String Catalogs, Swift Packages and default actor isolation to be Main Actor) are recommended by Apple, I believe it should be possible to use all these together like before Xcode 26.4.