error AD0001: Analyzer 'Microsoft.NetCore.CSharp.Analyzers.Runtime.CSharpDetectPreviewFeatureAnalyzer' threw an exception of type 'System.NullReferenceException'

### Analyzer

**Diagnostic ID**: AD0001: Analyzer 'Microsoft.NetCore.CSharp.Analyzers.Runtime.CSharpDetectPreviewFeatureAnalyzer' threw an exception of type 'System.NullReferenceException'

### Analyzer source

**SDK**: [Built-in CA analyzers in .NET 5 SDK or later](https://learn.microsoft.com/dotnet/fundamentals/productivity/code-analysis)

**Version**: SDK 9.0.105

### Describe the bug

I randomly get build failures like this:

> CSC : error AD0001: Analyzer 'Microsoft.NetCore.CSharp.Analyzers.Runtime.CSharpDetectPreviewFeatureAnalyzer' threw an exception of type 'System.NullReferenceException' with message 'Object reference not set to an instance of an object.'

### Steps To Reproduce

I don't know, it's random. Doing the same thing again usually succeeds.

### Expected behavior

No random build failure.

### Actual behavior

Random build failure.

## Additional context

Binlog:

[build-2025-03-25-112058.binlog.zip](https://github.com/user-attachments/files/19446359/build-2025-03-25-112058.binlog.zip)

The binlog shows this:

```
Exception occurred with following context:
Compilation: EmbeddedResources
System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.CodeAnalysis.MetadataHelpers.GetInfoForImmediateNamespaceMembers(Boolean isGlobalNamespace, Int32 namespaceNameLength, IEnumerable`1 typesByNS, StringComparer nameComparer, IEnumerable`1& types, IEnumerable`1& namespaces)
at Microsoft.CodeAnalysis.CSharp.Symbols.Metadata.PE.PENamespaceSymbol.LoadAllMembers(IEnumerable`1 typesByNS)
at Microsoft.CodeAnalysis.CSharp.Symbols.Metadata.PE.PENamespaceSymbol.GetMembers(ReadOnlyMemory`1 name)
at Microsoft.CodeAnalysis.CSharp.Symbols.MergedNamespaceSymbol.SlowGetChildrenOfName(ReadOnlyMemory`1 name)
at Microsoft.CodeAnalysis.Collections.CachingDictionary`2.AddToConcurrentMap(ConcurrentDictionary`2 map, TKey key)
at Microsoft.CodeAnalysis.Collections.CachingDictionary`2.GetOrCreateValue(TKey key)
at Microsoft.CodeAnalysis.CSharp.Binder.GetCandidateMembers(NamespaceOrTypeSymbol nsOrType, String name, LookupOptions options, Binder originalBinder)
at Microsoft.CodeAnalysis.CSharp.Binder.LookupMembersInNamespace(LookupResult result, NamespaceSymbol ns, String name, Int32 arity, LookupOptions options, Binder originalBinder, Boolean diagnose, CompoundUseSiteInfo`1& useSiteInfo)
at Microsoft.CodeAnalysis.CSharp.Binder.BindNonGenericSimpleNamespaceOrTypeOrAliasSymbol(IdentifierNameSyntax node, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics, NamespaceOrTypeSymbol qualifierOpt)
at Microsoft.CodeAnalysis.CSharp.Binder.BindQualifiedName(ExpressionSyntax leftName, SimpleNameSyntax rightName, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Binder.BindNamespaceOrTypeOrAliasSymbol(ExpressionSyntax syntax, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Binder.BindNamespaceOrTypeSymbol(ExpressionSyntax syntax, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Binder.BindQualifiedName(ExpressionSyntax leftName, SimpleNameSyntax rightName, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Binder.BindNamespaceOrTypeOrAliasSymbol(ExpressionSyntax syntax, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Binder.BindNamespaceOrTypeSymbol(ExpressionSyntax syntax, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Binder.BindQualifiedName(ExpressionSyntax leftName, SimpleNameSyntax rightName, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Binder.BindNamespaceOrTypeOrAliasSymbol(ExpressionSyntax syntax, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Binder.BindTypeOrAlias(ExpressionSyntax syntax, BindingDiagnosticBag diagnostics, ConsList`1 basesBeingResolved, Boolean suppressUseSiteDiagnostics)
at Microsoft.CodeAnalysis.CSharp.Symbol.LoadAndValidateAttributes(OneOrMany`1 attributesSyntaxLists, CustomAttributesBag`1& lazyCustomAttributesBag, AttributeLocation symbolPart, Boolean earlyDecodingOnly, Binder binderOpt, Func`2 attributeMatchesOpt, Action`1 beforeAttributePartBound, Action`1 afterAttributePartBound)
at Microsoft.CodeAnalysis.CSharp.Symbols.SourceAssemblySymbol.GetAttributes()
at Microsoft.CodeAnalysis.CSharp.Symbols.PublicModel.Symbol.Microsoft.CodeAnalysis.ISymbol.GetAttributes()
at Analyzer.Utilities.Extensions.ISymbolExtensions.HasAnyAttribute(ISymbol symbol, INamedTypeSymbol attribute)
at Microsoft.NetCore.Analyzers.Runtime.DetectPreviewFeatureAnalyzer.b__33_0(CompilationStartAnalysisContext context)
at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken)
-----
Suppress the following diagnostics to disable this analyzer: CA2252
CompilerServer: server - server processed compilation - EmbeddedResources (net9.0-tvos)

```

Start by examining the attached binlog and the DetectPreviewFeatureAnalyzer entry point, especially the stack through MetadataHelpers.GetInfoForImmediateNamespaceMembers and PENamespaceSymbol.LoadAllMembers. The first task is to identify a reproducible trigger for the random AD0001 failure in SDK 9.0.105; done means the analyzer no longer throws and the scenario has regression coverage.

Written by the indexing model from the issue text.