Bridging to @MainActor fails with error: call to main actor-isolated initializer 'init()' in a synchronous nonisolated context

[marcprux]

When running test cases against https://github.com/skiptools/skip-integ-demo/tree/main-actor, which simply adds @mainactor to the SkipIntegDemoModule:

/Users/marc/Library/Developer/Xcode/DerivedData/Skip-Everything-aqywrhrzhkbvfseiqgxuufbdwdft/SourcePackages/plugins/skip-integ-demo.output/SkipIntegDemoTests/skipstone/SkipIntegDemo/.build/SkipIntegDemo/swift/plugins/outputs/swift/SkipIntegDemo/destination/skipstone/SkipBridgeGenerated/SkipIntegDemo_Bridge.swift:23:26: error: call to main actor-isolated initializer 'init()' in a synchronous nonisolated context
20 | }
21 | @_cdecl("Java_skip_integ_demo_SkipIntegDemoModule_Swift_1constructor_10")
22 | func SkipIntegDemoModule_Swift_constructor_0(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer) -> SwiftObjectPointer {
   |      `- note: add '@MainActor' to make global function 'SkipIntegDemoModule_Swift_constructor_0' part of global actor 'MainActor'
23 |     let f_return_swift = SkipIntegDemoModule()
   |                          `- error: call to main actor-isolated initializer 'init()' in a synchronous nonisolated context
24 |     return SwiftObjectPointer.pointer(to: f_return_swift, retain: true)
25 | }

/Users/marc/Library/Developer/Xcode/DerivedData/Skip-Everything-aqywrhrzhkbvfseiqgxuufbdwdft/SourcePackages/plugins/skip-integ-demo.output/SkipIntegDemo/skipstone/SkipIntegDemo/src/main/swift/Sources/SkipIntegDemo/SkipIntegDemo.swift:5:12: note: calls to initializer 'init()' from outside of its actor context are implicitly asynchronous
 3 | @MainActor
 4 | public class SkipIntegDemoModule {
 5 |     public init() {
   |            `- note: calls to initializer 'init()' from outside of its actor context are implicitly asynchronous
 6 |     }
 7 | 

/Users/marc/Library/Developer/Xcode/DerivedData/Skip-Everything-aqywrhrzhkbvfseiqgxuufbdwdft/SourcePackages/plugins/skip-integ-demo.output/SkipIntegDemoTests/skipstone/SkipIntegDemo/.build/SkipIntegDemo/swift/plugins/outputs/swift/SkipIntegDemo/destination/skipstone/SkipBridgeGenerated/SkipIntegDemo_Bridge.swift:29:37: error: call to main actor-isolated instance method 'stringFunction()' in a synchronous nonisolated context
25 | }
26 | @_cdecl("Java_skip_integ_demo_SkipIntegDemoModule_Swift_1stringFunction_11")
27 | func SkipIntegDemoModule_Swift_stringFunction_1(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaString {
   |      `- note: add '@MainActor' to make global function 'SkipIntegDemoModule_Swift_stringFunction_1' part of global actor 'MainActor'
28 |     let peer_swift: SkipIntegDemoModule = Swift_peer.pointee()!
29 |     let f_return_swift = peer_swift.stringFunction()
   |                                     `- error: call to main actor-isolated instance method 'stringFunction()' in a synchronous nonisolated context
30 |     return f_return_swift.toJavaObject(options: [.kotlincompat])!
31 | }

/Users/marc/Library/Developer/Xcode/DerivedData/Skip-Everything-aqywrhrzhkbvfseiqgxuufbdwdft/SourcePackages/plugins/skip-integ-demo.output/SkipIntegDemo/skipstone/SkipIntegDemo/src/main/swift/Sources/SkipIntegDemo/SkipIntegDemo.swift:8:17: note: calls to instance method 'stringFunction()' from outside of its actor context are implicitly asynchronous
 6 |     }
 7 | 
 8 |     public func stringFunction() -> String {
   |                 `- note: calls to instance method 'stringFunction()' from outside of its actor context are implicitly asynchronous
 9 |         "Hello, World!"
10 |     }

/Users/marc/Library/Developer/Xcode/DerivedData/Skip-Everything-aqywrhrzhkbvfseiqgxuufbdwdft/SourcePackages/plugins/skip-integ-demo.output/SkipIntegDemoTests/skipstone/SkipIntegDemo/.build/SkipIntegDemo/swift/plugins/outputs/swift/SkipIntegDemo/destination/skipstone/SkipBridgeGenerated/SkipIntegDemo_Bridge.swift:34:42: error: call to main actor-isolated static method 'fromJavaObject(_:options:)' in a synchronous nonisolated context
 4 | extension SkipIntegDemoModule: BridgedToKotlin, BridgedToKotlinBaseClass {
 5 |     private static let Java_class = try! JClass(name: "skip/integ/demo/SkipIntegDemoModule")
 6 |     public static func fromJavaObject(_ obj: JavaObjectPointer?, options: JConvertibleOptions) -> Self {
   |                        `- note: calls to static method 'fromJavaObject(_:options:)' from outside of its actor context are implicitly asynchronous
 7 |         let ptr = SwiftObjectPointer.peer(of: obj!, options: options)
 8 |         return ptr.pointee()!
   :
31 | }
32 | @_cdecl("Java_skip_integ_demo_SkipIntegDemoModule_Swift_1projectionImpl")
33 | func SkipIntegDemoModule_Swift_projectionImpl(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ options: Int32) -> JavaObjectPointer {
   |      `- note: add '@MainActor' to make global function 'SkipIntegDemoModule_Swift_projectionImpl' part of global actor 'MainActor'
34 |     let projection = SkipIntegDemoModule.fromJavaObject(Java_target, options: JConvertibleOptions(rawValue: Int(options)))
   |                                          `- error: call to main actor-isolated static method 'fromJavaObject(_:options:)' in a synchronous nonisolated context
35 |     let factory: () -> Any = { projection }
36 |     return SwiftClosure0.javaObject(for: factory, options: [.kotlincompat])!

> Task :SkipIntegDemo:buildLocalSwiftPackage FAILED