[Regression] CA1825: False positive on .NET 11 Preview1

[bkoelman]

Version Used:
.NET 11 Preview 1 with VS Insiders 2026 [11513.90]

This is a regression. The problem does not occur using stable .NET 10 and stable VS 2026.

Steps to Reproduce:
Using xUnit, a suggestion is reported on the following lines:

public sealed class ModelStateValidationTests : IClassFixture<OpenApiTestContext>
{
    public static readonly TheoryData<string> SchemaNames =
    [ /* SUGGESTION HERE */
        "attributesInCreateTypeContainerRequest",
        "attributesInUpdateTypeContainerRequest",
        "attributesInTypeContainerResponse"
    ];
}

Applying the fix changes nothing. After applying it, the fix disappears from the context menu.
The following popup is displayed:

Message from the screenshot:

System.InvalidCastException : Unable to cast object of type 'Microsoft.CodeAnalysis.CSharp.Symbols.PublicModel.NonErrorNamedTypeSymbol' to type 'Microsoft.CodeAnalysis.IArrayTypeSymbol'.
   at Microsoft.NetCore.Analyzers.Runtime.AvoidZeroLengthArrayAllocationsFixer.GetArrayElementType(SyntaxNode arrayCreationExpression,SemanticModel semanticModel,CancellationToken cancellationToken)
   at async Microsoft.NetCore.Analyzers.Runtime.AvoidZeroLengthArrayAllocationsFixer.ConvertToArrayEmptyAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.NetCore.Analyzers.Runtime.AvoidZeroLengthArrayAllocationsFixer.<>c__DisplayClass4_0.<RegisterCodeFixesAsync>b__0(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.CodeActions.CodeAction.GetChangedSolutionAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.CodeActions.CodeAction.ComputeOperationsAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.CodeActions.CodeAction.ComputePreviewOperationsAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.CodeActions.CodeAction.DocumentChangeAction.ComputePreviewOperationsAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.CodeActions.CodeAction.GetPreviewOperationsAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.EditorSuggestedAction.GetPreviewOperationsAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.EditorSuggestedAction.GetPreviewResultAsync(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.EditorSuggestedActionWithNestedFlavors.<>c__DisplayClass16_0.<GetPreviewAsync>b__0(<Unknown Parameters>)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at async Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.PerformFunctionAsync[T](<Unknown Parameters>)

Diagnostic Id:
CA1825: Avoid unnecessary zero-length array allocations. Use Array.Empty() instead.

Expected Behavior:
No suggestion.

Actual Behavior:
A suggestion is offered. We've increased the severity to Warning in Release builds. Combined with warnaserror, this breaks the build.