MudBlazor - MudTextField different behaviour

I have a .NET 8 Blazor MAUI Hybrid App using MudBlazor.

I use a multiline MudTextField with EditForm for submitting messages.

My goal was to send the message with Enter and get a new line with Shift + Enter.

So I am getting close to it using OnKeyDown and KeyDownPreventDefault properties of MudTextField.

But in my Blazor MAUI app it has a different behaviour than in TryMudBlazor.

• Blazor MAUI App on GitHub
• TryMudBlazor

Code

<EditForm Model="@model" OnValidSubmit="Submit"><DataAnnotationsValidator /><MudCard Style="width: 250px" Class="mb-3"><MudCardContent><MudTextField                T="string"                Immediate="true"                OnKeyDown="HandleKeyDown"                KeyDownPreventDefault="_preventDefault"                TextUpdateSuppression="false"                @bind-Value="model.Prompt"                Placeholder="Type a message..."                Variant="Variant.Filled"                For="@(() => model.Prompt)"                AutoGrow                MaxLines="14"                TextChanged="TextChangedTest"/></MudCardContent><MudCardActions Class="pt-0"><MudSpacer/><MudTooltip Text="Submit"><MudIconButton ButtonType="ButtonType.Submit" Icon="@Icons.Material.Filled.Send" Size="Size.Small" Color="Color.Primary"></MudIconButton></MudTooltip></MudCardActions></MudCard>    @foreach (var message in messages) {<div>@message</div>    }</EditForm>@code {    bool _preventDefault;    List<string> messages = new();    PromptForm model = new PromptForm();    public class PromptForm    {        [Required]        public string Prompt { get; set; }    }    protected void HandleKeyDown(KeyboardEventArgs e)    {        if (e.Key == "Enter" && !e.ShiftKey)        {            _preventDefault = true;            Submit();        }        else        {            _preventDefault = false;        }    }    public void Submit()    {        messages.Add($"Prompt: {model.Prompt}");        model.Prompt = string.Empty;        StateHasChanged();    }    public void TextChangedTest(string text)    {        messages.Add($"Text changed: '{text}'");    }}

Example

When I type in hi and press Enter these are my results:

Blazor MAUI

TryMudBlazor

As you can see the TryMudBlazor does the desired thing - submitting and clearing out the text field.

.NET BLAZOR MAUI, on the other hand, also seems to try it, at least the field is emptied for a short time, but then it fills up again with the old value.

I'm going crazy here, I just can't figure out what the problem is.

Small addition

Before it was a Blazor server app and there at least the textbox could be cleared if you did NOT specify a rendermode (I had @rendermode=“InteractiveServer”)

That pretty much broke everything else but at least the textbox worked

Maybe this is a clue... or not... I am at the end