Blazor Server vs WASM - different output on enumerable is ICollection<int>

[tesar-tech]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Blazor app and this code:

List<int> list = [1,2,3];
IEnumerable<int> enumerable =list.Take(2);
bool isCollection = enumerable is ICollection<int>;

Console.WriteLine($"is ICollection: {isCollection} "); //true on server, false on wasm

Expected Behavior

The result should be the same on Blazor Servers and Blazor Wasm.

Steps To Reproduce

Clone this bug report repo (simple blazor app), run the app and visit:

• http://localhost:5031/
  • It will output isCollection as true
  • The exact code/page: https://github.com/tesar-tech/blazor_wasm_vs_server_bug/blob/master/blazor_wasm_vs_server_bug/Components/Pages/Home.razor
• http://localhost:5031/wasmhome
  • It will output false (it will briefly have true because of pre-rendering, but that's not the point)
  • The exact code/page: https://github.com/tesar-tech/blazor_wasm_vs_server_bug/blob/master/blazor_wasm_vs_server_bug.Client/WasmHome.razor

Exceptions (if any)

No response

.NET Version

9.0.100 (but was also on 8)

Anything else?

No response