Scope and Navigation Window don't work properly with many repositories

[Leo-Adlakha]

Describe the bug
I have a Opengrok instance, but the Scope and Navigate windows don't work in my main instance.

Opengrok: v1.7.38
Tomcat: v10..

I just get an empty window for any project I open.

To Reproduce
I have two instances, one with 7 projects(lets call it dev instance) and the other with ~1300 projects( lets call it qa instance), more to come. In the dev instance, scope doesn't work properly but navigation works, but in the qa instance, nothing works, even the syntax highlighting is not clearly there in the qa instance, but in dev instance, it seems to be correct.

Expected behavior
Working Scope and Navigation Window

Additional context
This seems to happen during indexing I think, but I am not sure what do I need to change to have this working.

[Leo-Adlakha]

I have tried configuring ctagsTimeout, I think maybe that could've caused the problem, but still no luck.

[Leo-Adlakha]

Just noticed, It works in some of the repositories, but not in all. ( just navigation working )