Error when TearDown method is defined in partial test classes - Syntax node is not within syntax tree

[KaiBNET]

When a test class is separated into different files via partial classes and contain a method marked with TearDown attribute, I get the following error:

Error AD0001: Analyzer 'NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer' threw an exception of type 'System.ArgumentException' with message 'Syntax node is not within syntax tree'.

When I move the TearDown method into a base class, everything works.

[izhovkin]

Have the same error in partial test class, however, it does not have TearDown methods. Looks like it occurs when analyzing field assignments.

Stacktrace:

Errors
            CSC error AD0001: Analyzer 'NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer' threw an exception of type 'System.ArgumentException' with message 'Syntax node is not within syntax tree'. [***.csproj]
        Exception occurred with following context:
        Compilation: ***.UnitTests
        SyntaxTree: ***Tests.cs
        SyntaxNode: [TestFixture] public partial class ... [ClassDeclarationSyntax]@[664..25904) (19,4)-(572,5)
        System.ArgumentException: Syntax node is not within syntax tree
        at Microsoft.CodeAnalysis.CSharp.CSharpSemanticModel.CheckSyntaxNode(CSharpSyntaxNode syntax)
        at Microsoft.CodeAnalysis.CSharp.CSharpSemanticModel.GetTypeInfo(ExpressionSyntax expression, CancellationToken cancellationToken)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.NeedsDisposal(SemanticModel model, ExpressionSyntax expression)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AssignedIn(Parameters parameters, HashSet`1 assignments, ExpressionSyntax expression)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AssignedIn(Parameters parameters, HashSet`1 assignments, StatementSyntax statement)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AssignedIn(Parameters parameters, HashSet`1 assignments, SyntaxList`1 statements)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AssignedIn(Parameters parameters, HashSet`1 assignments, StatementSyntax statement)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AssignedIn(Parameters parameters, HashSet`1 assignments, BaseMethodDeclarationSyntax method)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AssignedIn(Parameters parameters, HashSet`1 assignments, IMethodSymbol symbol)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AssignedIn(Parameters parameters, HashSet`1 assignments, IEnumerable`1 methods)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AnalyzeAssignedButNotDisposed(SyntaxNodeAnalysisContext context, Dictionary`2 symbols, Parameters parameters, String where, IEnumerable`1 setUpMethods, IEnumerable`1 tearDownMethods, HashSet`1 assignedWithInitializers)
        at NUnit.Analyzers.DisposeFieldsInTearDown.DisposeFieldsAndPropertiesInTearDownAnalyzer.AnalyzeDisposableFields(SyntaxNodeAnalysisContext context)
        at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.<>c__52`1.<ExecuteSyntaxNodeAction>b__52_0(ValueTuple`2 data)
        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: NUnit1032