I noticed that when the ReadTimeout property of the FileSelect's FileInfoStream is read, the code seem to block completely.

You will find a Blazor Web App project attached to this ticket showcasing the issue.

When enabling/disabling a form element that is defined in a child component, the element is successfully disabled, however a console error occurs. The error occurs whether the child component makes the update or the parent makes the update through a passed parameter.  The error does not occur for form elements defined in the parent.  The error does not occur for basic html input elements defined in the child. 

Element definition:

<TelerikTextBox 
     Id="ElementMisc" 
     AutoComplete="new-password" 
     @bind-Value="@_searchModel.ElementMisc" 
     Enabled="!_elementSelectMode" 
     class="textbox-75"
     DebounceDelay="0">
 </TelerikTextBox>

Update Code defined in child:

 if (results.Data.Count > 1)
 {   
     _elementSelectMode= true;
     StateHasChanged();

 }

Console Error:

Uncaught (in promise) Error: Assertion failed - heap is currently locked
    at mr (blazor.web.js:1:158963)
    at Object.beginInvokeDotNetFromJS (blazor.web.js:1:157244)
    at w.invokeDotNetMethodAsync (blazor.web.js:1:3978)
    at C.invokeMethodAsync (blazor.web.js:1:5486)
    at r.invokeMethodAsync (telerik-blazor.js:22:1272553)
    at r.onBlur (telerik-blazor.js:22:1463592)
    at ye.setOrRemoveAttributeOrProperty (blazor.web.js:1:28630)
    at ye.applyAttribute (blazor.web.js:1:27574)
    at ye.applyEdits (blazor.web.js:1:24601)
    at ye.updateComponent (blazor.web.js:1:23606)