Missing results in search

**DocFX Version Used**: 2.23 (I think? Whatever is installed with chocolatey- would be useful to have the DocFX version in the footer of the default template)

**Template used**: `default`

**Steps to Reproduce**:

1. Build docs for this repo: https://github.com/tzachshabtay/MonoAGS (you can use the appveyor script at the root of the repo).
2. Go to the generated website (or, alternatively, look at the one already built: https://tzachshabtay.github.io/MonoAGS/api/AGS.API.html)
3. In the search bar, type "IWalk"

**Expected Behavior**:

Expecting to find `IWalkableArea`, `IWalkBehindArea` and `IWalkBehavior` as results, as I have those interfaces (and probably more results).

**Actual Behavior**:

No matches.

**More Scenarios**:

Type "Walk" -> Now I do see those interface in the results?
Type "WalkBehavior" -> I don't see `IWalkBehavior`
Type "IWalkBehavior" -> Now I do see `IWalkBehavior`
Type "Walkable" -> I can see `IWalkableArea`
Type "WalkableArea" -> And now I can't see `IWalkableArea`.