RoboServer: Topics Not Showing in Search Results

I've recently published a merged project to the RoboServer and noticed that the results only show baggage files (e.g., PDFs, Excel sheets) but not topics (i.e., HTM files). The search works fine locally.

The help is using the Responsive Layout format (Indigo layout). I've published another non-merged project, also using responsive help and the same layout, to the same server and the search works correctly on the server. Does the server search engine not index merged content?

We are using RoboHelp 2019 (Classic) v14.0.7.004 and RoboSever v10.0.1.237

Thanks,