Welcome topic (index.htm) is displayed as a TOC within a TOC
After upgrading a help system from RoboHelp 2015 to the latest version (2022.5.8), the Welcome topic (index.htm) is not loading correctly.

As you can see in the preceding image, the TOC is displayed within another TOC and the Welcome topic fails to load. All other help topics are displayed as expected.
Here’s what the Welcome topic looks like in the previous RoboHelp 2015 version:

