[BUG] TouchEffect does not work on iOS when app is built in Release

[velocitysystems]

Is there an existing issue for this?

• I have searched the existing issues

Did you read the "Reporting a bug" section on Contributing file?

• I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

Current Behavior

TouchEffect does not work on iOS when app is built in Release.
This is a regression in 9.1.0 and possibly due to AOT improvements.

Expected Behavior

TouchEffect should work and fire events/execute commands when attached to a view.

Steps To Reproduce

1. Create a new blank MAUI project
2. Add a TouchEffect to any control
3. Build the app in Release configuration

Link to public reproduction project repository

AotSample.zip

Environment

- .NET MAUI CommunityToolkit: 9.1.0
- OS: iOS 17.5
- .NET MAUI: 8.0.91 SR9.1 (latest)

Anything else?

Works in 9.0.3.
Android works in both Debug and Release.

[dotnet-policy-service]

Hi @velocitysystems. We have added the "needs reproduction" label to this issue, which indicates that we cannot take further action. This issue will be closed automatically in 5 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[velocitysystems]

@brminnick Added reproduction project.
I also get a persistent startup crash when debugging on iOS (Android is unaffected):

System.TypeLoadException: Could not set up parent class, due to: Invalid generic instantiation assembly:/Users/dev/Library/Developer/CoreSimulator/Devices/F766998B-9560-4192-90C8-DEC128E8E6D9/data/Containers/Bundle/Application/C4DE1219-9F4A-4D31-9354-A887F27BD4BF/AotSample.app/Microsoft.Maui.dll type:ViewHandler`2 member:(null)
   at CommunityToolkit.Maui.AppBuilderExtensions.<>c.<UseMauiCommunityToolkit>b__0_0(IMauiHandlersCollection h)
   at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.HandlerRegistration.AddRegistration(IMauiHandlersCollection builder)
   at Microsoft.Maui.Hosting.Internal.MauiHandlersFactory.CreateHandlerCollection(IEnumerable`1 registrationActions)
   at Microsoft.Maui.Hosting.Internal.MauiHandlersFactory..ctor(IEnumerable`1 registrationActions)
   at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.<>c.<ConfigureMauiHandlers>b__1_0(IServiceProvider sp)

I've tried the following steps mentioned here with no luck:

• Update .NET 8 SDK to latest
• Update MAUI workloads via dotnet workload update
• Drop bin and obj
• Clear local NuGet package cache

Rolling back to 9.0.3 everything works fine.

[bijington]

We don't accept a zip file as a reproduction sample due to potential security reasons. That said I believe this issue might be solved in PR #2243

[MitchBomcanhao]

same issue here. haven't tried downgrading yet, but this really needs fixing...
edit: it does indeed work again when downgrading to 9.0.3