Find All References finds nothing for indexers declared outside the solution

[jnm2]

Visual Studio 2019 Preview 1.1

There doesn't seem to be a way to invoke Find All References on an indexer except by navigating to the type in metadata view or decompiled sources and finding the indexer declaration (invoking FAR on the this token). When I do this, there are no results even though I clearly see usages all over the solution. (To verify, I enabled ReSharper and tried its Find Usages and got 119 results.)

So there's basically no way to find all places where my solution uses an indexer defined outside the solution.