SwiftData SchemaMigrationPlan and VersionedSchema not Sendable?

I've just tried to update a project that uses SwiftData to Swift 6 using Xcode 16 beta 1, and it's not working due to missing Sendable conformance on a couple of types (MigrationStage and Schema.Version):

struct LocationsMigrationPlan: SchemaMigrationPlan {
    static let schemas: [VersionedSchema.Type] = [LocationsVersionedSchema.self]
    static let stages: [MigrationStage] = []
}

struct LocationsVersionedSchema: VersionedSchema {
    static let models: [any PersistentModel.Type] = [
        Location.self
    ]

    static let versionIdentifier = Schema.Version(1, 0, 0)
}

This code results in the following errors:

error: static property 'stages' is not concurrency-safe because non-'Sendable' type '[MigrationStage]' may have shared mutable state
    static let stages: [MigrationStage] = []
               ^
error: static property 'versionIdentifier' is not concurrency-safe because non-'Sendable' type 'Schema.Version' may have shared mutable state
    static let versionIdentifier = Schema.Version(1, 0, 0)
               ^

Am I missing something, or is this a bug in the current seed? I've filed this as FB13862584.