ComboBox breaks when binding to model

[Simon]

Finally updated to the telerik blazor 2.9.0 release, but now the combobox does not bind to the model correctly.  The best error is "WASM: Microsoft.JSInterop.JSException: Failed to execute 'observe' on 'IntersectionObserver': parameter 1 is not of type 'Element'."  

The markup from the razor form: 

<TelerikComboBox Data="@SelectableClaims" TItem="ClaimModel" TValue="int" ValueField="Number" Placeholder="Claim #" ClearButton="true" Width="150px" TextField="Name" ValueChanged="@((int num) => SelectClaim(claim, num))"></TelerikComboBox>

 

 

However, I tried the telerik code in the documentation, it produces the same error.  The full error is reproduced below.

 

blazor.webassembly.js:1 WASM: Unhandled exception rendering component:
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM: Microsoft.JSInterop.JSException: Failed to execute 'observe' on 'IntersectionObserver': parameter 1 is not of type 'Element'.
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM: TypeError: Failed to execute 'observe' on 'IntersectionObserver': parameter 1 is not of type 'Element'.
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at e.value (https://kendo.cdn.telerik.com/blazor/2.8.0/telerik-blazor.min.js:38:23963)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at new e (https://kendo.cdn.telerik.com/blazor/2.8.0/telerik-blazor.min.js:38:20476)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at r (https://kendo.cdn.telerik.com/blazor/2.8.0/telerik-blazor.min.js:1:6519)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at Object.r (https://kendo.cdn.telerik.com/blazor/2.8.0/telerik-blazor.min.js:38:18001)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at https://localhost:5001/_framework/blazor.webassembly.js:1:9740
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at new Promise (<anonymous>)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at Object.beginInvokeJSFromDotNet (https://localhost:5001/_framework/blazor.webassembly.js:1:9709)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at _mono_wasm_invoke_js_marshalled (https://localhost:5001/_framework/wasm/dotnet.3.2.0-preview2.20159.2.js:1:162942)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at do_icall (wasm-function[6008]:0x10e0aa)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:     at do_icall_wrapper (wasm-function[1886]:0x51cc2)
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:   at System.Threading.Tasks.ValueTask`1[TResult].get_Result () <0x3031c70 + 0x0002c> in <filename unknown>:0
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:   at Telerik.Blazor.Components.Popup.TelerikPopupBase.OnAfterRenderAsync (System.Boolean firstRender) <0x3716860 + 0x00124> in <filename unknown>:0
p.printErr @ blazor.webassembly.js:1
blazor.webassembly.js:1 WASM:   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask (System.Threading.Tasks.Task taskToHandle) <0x2f484a8 + 0x000c2> in <filename unknown>:0

[Simon]

Fixed it. It was pulling the wrong version of the telerik-blazor.min.js file from the CDN.