Another SandCastle problem: Reports missing Summary and Param, but they aren't missing

Question

I'm using SandCastle Help File Builder in Visual Studio 2022. After generating the help files from my C# XML Comments file, the generated documentation shows red comments about "missing summary" and/or "missing param", but they aren't really missing.

Here is a picture of one of my documented methods.

Documented method with errors reported

However, as can be seen below, my XML Comments file does show that method with a section and a section.

Summary and param present

The XML comments are correct, so I was expecting to see them documented in the generated HTML help file. Also, the XML Comments file and the assembly file are included in the Documentation Sources.