Checkboxes in Blazor filters disappear when updating options in .NET MAUI Blazor

[JuanHSlig]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

When manipulating filters (e.g., select elements with checkboxes) in a Blazor application—including tests in .NET MAUI Blazor—it has been observed that dynamically updating the options causes the currently selected value to disappear from the dropdown. This occurs even when forcing a UI refresh with StateHasChanged().

Expected Behavior

Expected behavior:
Filters should update dependently without visually removing the selected option.
Actual behavior:
The previously selected option disappears from the list after applying another filter, suggesting an issue with visual state updates.
Impact:
This affects the usability of the filtering functionality, as the user cannot see the applied filter, even though it is being used internally.
Verification steps:
I have replicated this behavior in both a standard Blazor application and .NET MAUI Blazor.

Steps To Reproduce

• Select a project filter that reduces the list of available cities.
• Then, select a city filter.
• Observe that the previously selected project filter visually disappears, even though it remains internally selected.

Exceptions (if any)

Impact:
This affects the usability of the filtering functionality, as the user cannot see the applied filter, even though it is being used internally.
Verification steps:
I have replicated this behavior in both a standard Blazor application and .NET MAUI Blazor.
Request:
Could you investigate whether this is a bug in Blazor’s rendering engine and, if confirmed, provide a solution or repair plan?
Thank you for your attention.

.NET Version

• .NET 9 (and .NET MAUI Blazor)

Anything else?

Using the latest stable versions of ASP.NET Core and Blazor.

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