MonoGame NullReferenceException on iOS - f#

Question

I'm trying to build a simple MonoGame app for iOS using F#. I have done this by manually cooking up a fsproj file, on the basis of project files for
F# iOS Single Page Application (template),
F# console application (template) and
C# iOS MonoGame (template).
My code looks like this:
namespace MonoGameFSharpTemplate
module Game =
open Microsoft.Xna.Framework
open Microsoft.Xna.Framework.Graphics
open Microsoft.Xna.Framework.Input
open Microsoft.Devices.Sensors
type Game1 () as x =
inherit Game()
do x.Content.RootDirectory <- "Content"
member val graphics = new GraphicsDeviceManager(x) with get, set
override x.Initialize() =
do base.Initialize()
override x.LoadContent() = ()
override x.Update (gameTime) =
do base.Update(gameTime)
override x.Draw (gameTime) =
do base.Draw(gameTime)
module App =
open UIKit
open Foundation
open Game
[<Register("AppDelegate")>]
type AppDelegate() =
inherit UIApplicationDelegate()
override val Window = null with get, set
override this.FinishedLaunching(app, options) =
use game = new Game1()
game.Run()
true
module Main =
open UIKit
[<EntryPoint>]
let main argv =
UIApplication.Main(argv, null, "AppDelegate")
0
It should be pretty much equivalent to the code provided in the C# template (which runs just fine, by the way).
When running this code in the iOS simulator, I get a NullReferenceException with the following stack trace
at Microsoft.Xna.Framework.Game.get_IsActive () [0x00000] in <d3066bb8224f42c4ab3ae66d66329856>:0
at Microsoft.Xna.Framework.iOSGamePlatform.Tick () [0x00006] in <d3066bb8224f42c4ab3ae66d66329856>:0
at Microsoft.Xna.Framework.iOSGameView.DoTick () [0x00000] in <d3066bb8224f42c4ab3ae66d66329856>:0
at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/5024/152b654a/source/xamarin-macios/src/UIKit/UIApplication.cs:79
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/5024/152b654a/source/xamarin-macios/src/UIKit/UIApplication.cs:63
at MonoGameFSharpTemplate.Main.main (System.String[] argv) [0x00000] in /Users/torbonde/Projects/MonoGameFSharpTemplate/MonoGameFSharpTemplate/Program.fs:47
I'm running the latest MonoGame build, v3.7.0.937, but I had the same issue using v3.6.
Does anyone know why I'm getting this error, and how to fix it? I can post the project file with references if necessary.