Describe the bug
The modules list is not (at least not always) generated when using Doxygen 1.10.

Expected behavior
In a documentation generated with a previous version of Doxygen (1.9.1 for example), when we define a tab usergroup inside a layout xml file that contains a tab modules:

• A modules.html file is generated.
• When opening the index file, if we hover with the mouse the tab corresponding to the usergroup, a dropdown menu appear with the contents of the usergroup including the modules list among its items.

Actual behavior

• No modules.html is generated.
• When opening the index file, if we hover with the mouse the tab corresponding to the usergroup, the dropdown menu does not contain an item for the modules list.

Screenshots

To Reproduce
Run the bat script contained in the reproducer (after editing to set some variables appropriately for your machine) contained in file reproducerBugModulesList.zip.
reproducerBugModulesList.zip

Version
Doxygen version used: 1.10.0
Platform: Windows 10