After upgrading VS to VS2026 I noticed that it does not document the file as expected.  See below for portion of the log file showing an exception.  I can confirm that the namespace documents as well as the header is partially documented, but drops the assembly name, but classes, records, properties, etc fail to document.

Date and Time: 11/12/2025 10:06:58 AM

IP Address: {0}

OS Platform: Win32NT

Processor: AMD64

OS version: 10.0.26100.0

Current user role:  User;

Allocated Memory: 751 Mb

Available Physical Memory: 1 Mb

Available Virtual Memory: 1 Mb

Total Physical Memory: 3769 Mb

Total Virtual Memory: 697 Mb

Percentage of physical memory In use: 42 %

NET Framework version: 4.0.30319.42000

Visual Studio version: 18.0

Visual Studio file: C:\Program Files\Microsoft Visual Studio\18\Professional\Common7\IDE\devenv.exe

Visual Studio file version: 18.0.11205.157

Application Domain: DefaultDomain

Product Version: 

Assembly Codebase: file:///c:/users/{REDACTED}/appdata/local/microsoft/visualstudio/18.0_8b93e5a5/extensions/2nm2xrjh.quw/SubMain.GhostDoc.Core.DLL

Assembly Version: 2.2.0.0

Assembly Build Date: 11/12/2025 9:36:02 AM

Assembly Full Name: SubMain.GhostDoc.Core, Version=2.2.0.0, Culture=neutral, PublicKeyToken=94c677ee32cc1929

Exception Source: Microsoft.VisualStudio.Interop

Exception Type: System.Runtime.InteropServices.COMException

Exception Message: DocumentMember: Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))

Exception Target Site: get_Parent

---- Stack Trace ----

 EnvDTE.CodeProperty.get_Parent()

 SubMain.GhostDoc.Core.DLL: N 00000

 A.c4beb3839d623f2af95010cd0951cf1bb.c0012a3cfd6f80130a0508007ae497b4b( As Object)

 SubMain.GhostDoc.Core.DLL: N 00030

 SubMain.GhostDoc.T4.CodeElement..ctor(ctxtObj As Object, codeElementInfo As Object, codeLanguage As CodeLanguage)

 SubMain.GhostDoc.Core.DLL: N 02969

 SubMain.GhostDoc.T4.Context.Initialize(ctxtObj As Object, parameters As Hashtable, codeLanguage As CodeLanguage)

 SubMain.GhostDoc.Core.DLL: N 00652

 A.cd050f4b250007320e50fe5e958b5cd4e.c4f6b19298f078933cb0df4efa49ca6e2( As c2ea400aa07f04bd1cebc5abf5f4aeff2,  As Rule,  As MemberRuleArgs,  As Object)

 SubMain.GhostDoc.Core.DLL: N 00188

 A.c476f267f986334d5e33e073bcdbd1f86.cd822087bce47457322ab2922883a634b()

 SubMain.GhostDoc.Core.DLL: N 00765

 A.c476f267f986334d5e33e073bcdbd1f86.c0d776bf94ff22ffe18c6ef8ce5689681( As Boolean)

 SubMain.GhostDoc.Core.DLL: N 00031

 A.c34619165aba414d27648090d62429ef1.cea20907df77db43e6a93c9c36538560e( As c2ea400aa07f04bd1cebc5abf5f4aeff2,  As TextSelection,  As Object,  As CodeLanguage,  As Boolean)

 SubMain.GhostDoc.Core.DLL: N 00525

Log Message (11/12/2025 10:06:58 AM) : DocumentThisCommandImplementation->Run finished.

Log Message (11/12/2025 10:07:22 AM) : SendStatistics method started...

Log Message (11/12/2025 10:07:22 AM) : SendStatistics method finished