Processing of message 'al/gotodefinition' failed with error: 'Value cannot be null. (Parameter 'projectId')'

[Error - 7:58:52 PM] Please report this issue to https://github.com/microsoft/al/issues including information on how to reproduce it, if possible.
Processing of message 'al/gotodefinition' failed with error: 'Value cannot be null. (Parameter 'projectId')'
Details:
System.ArgumentNullException: Value cannot be null. (Parameter 'projectId')
at Microsoft.Dynamics.Nav.CodeAnalysis.Workspaces.Solution.GetProject(ProjectId projectId) in X:\source\Prod\Microsoft.Dynamics.Nav.CodeAnalysis.Workspaces\Workspace\Solution\Solution.cs:line 281
at Microsoft.Dynamics.Nav.EditorServices.Protocol.LanguageServer.ReferenceSymbolDefinitionManager.EnsureCompilationContextIsSet(CancellationToken token) in X:\source\Prod\Microsoft.Dynamics.Nav.EditorServices.Protocol\LanguageServer\ReferenceSymbolDefinitionManager.cs:line 211
at Microsoft.Dynamics.Nav.EditorServices.Protocol.LanguageServer.ReferenceSymbolDefinitionManager.GetDefinitionForSymbolAtPositionAsync(Uri previewUri, Position requestPosition, LaunchConfiguration configuration, CancellationToken cancellationToken) in X:\source\Prod\Microsoft.Dynamics.Nav.EditorServices.Protocol\LanguageServer\ReferenceSymbolDefinitionManager.cs:line 98
at Microsoft.Dynamics.Nav.EditorServices.Protocol.LanguageServer.Extensions.AlDefinitionRequestHandler.ProcessRequestAsync(AlDefinitionRequest request, Int32 requestId, CancellationToken cancellationToken) in X:\source\Prod\Microsoft.Dynamics.Nav.EditorServices.Protocol\LanguageServer\Extensions\AlDefinitionRequestHandler.cs:line 57
at Microsoft.Dynamics.Nav.EditorServices.Protocol.LanguageServer.Extensions.NavServerRequestHandler2.HandleAsync(T request, Int32 requestId, CancellationToken cancellationToken) in X:\source\Prod\Microsoft.Dynamics.Nav.EditorServices.Protocol\LanguageServer\Extensions\NavServerRequestHandler.cs:line 40 at Microsoft.Dynamics.Nav.EditorServices.Protocol.MessageProtocol.RequestHandlerBase1.HandleAsync(JToken requestContents, Int32 requestId, CancellationToken cancellationToken) in X:\source\Prod\Microsoft.Dynamics.Nav.EditorServices.Protocol\MessageProtocol\RequestHandlerBase.cs:line 85
at Microsoft.Dynamics.Nav.EditorServices.Protocol.RequestRegistry.Process(Message message) in X:\source\Prod\Microsoft.Dynamics.Nav.EditorServices.Protocol\Endpoints\RequestRegistry.cs:line 84

Start with ReferenceSymbolDefinitionManager.cs at EnsureCompilationContextIsSet and trace the al/gotodefinition request through AlDefinitionRequestHandler.cs and Solution.cs. Reproduce the request if possible and determine why projectId is null; done means the request no longer fails with this ArgumentNullException.