OnInput intermittently not working

[dotnetKyle]

Describe the bug

When I set an OnInput action that modifies the incoming input, the change I have made is not reflected in the UI.

To Reproduce

<label>MyString: </label>
<input type="text" @oninput="inputFilter" value="@myString" />

@code {
    private string myString { get; set; }
    private void inputFilter(ChangeEventArgs args)
    {
        if(args.Value != null)
        {
            var value = args.Value.ToString();
            myString = value.Replace("a", "");
        }
    }
}

Now run the application, type into the textbox some text, then type an 'a' character. If reproduced, the 'a' does not get replaced until you type another VALID character. Odd behavior. No exceptions are thrown. Try typing several a's in a row; then type another character.

Note: I have seen this related issue/work around (#17702 (comment)), not 100% certain that it applies here but it does work around my problem at the moment.

Further technical details

• .NET Core 3.1
• Running in Visual Studio Professional 16.4.5
• Output of dotnet --info

.NET Core SDK (reflecting any global.json):
 Version:   3.1.101
 Commit:    b377529961

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.18363
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.1.101\

Host (useful for support):
  Version: 3.1.1
  Commit:  a1388f194c

.NET Core SDKs installed:
  2.1.202 [C:\Program Files\dotnet\sdk]
  2.1.509 [C:\Program Files\dotnet\sdk]
  2.1.511 [C:\Program Files\dotnet\sdk]
  3.1.101 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

[dotnetKyle]

Note to all looking for a work-around, this is the code I am writing to get it working for the moment:

MyString: <input type="text" @bind-value="MyString" @bind-value:event="oninput"/>

string _myString { get; set; }
string MyString
{
    get
    {
       return _myString;
    }
    set
    {
        _myString = value.Replace("a", "");
    }
}

[mkArtakMSFT]

Thanks for contacting us. This is a dupe of #17281.