Xcode 13.3 beta 2, code completion error

example:

import Vapor
 
struct MainController: RouteCollection {
 
    func boot(routes: RoutesBuilder) throws {
 
        routes.get(use: index(req:))
        //              ↑ there
        //  if i typing `index` and chosen  from selection picker, it will display `index(req: <#Request#>)` not `index(req:)`
        //  but when i typing `self.index` and chosen from selection picker, it will work normal
    }
}
 
private extension MainController {
 
    func index(req: Request) throws -> EventLoopFuture<View> {
 
        req.view.render("index", ["title": "Hi guys~", "md_file": "/index.md"])
 
    }
 
}

Environment:

• Xcode 13.3 beta 2

• Intel chip, MacBook Pro (16-inch, 2019), macOS monterey 12.2.1 (21D62)