Reflection issues

I have a proto set with 3 gRPC services (and some external dependencies) that compiles appropriately on the protobuf side, compiles and runs in go, and clients work when interacting with the server, but reflection fails within `grpcurl` on the 2 services which have dependencies in other packages.

I recreated a fake weatherman repo with a similar setup to provide an example.

proto & generated code repo: https://github.com/jamisonhyatt/grpc-multi-pkg-protos
Client gist: https://gist.github.com/jamisonhyatt/dd9d93b978472c960c9fa81b9f39fcf9

Here's `tree` of the protoset
```
└── protos
├── desktop_svc
│   └── desktop_svc.proto
├── external
│   ├── location
│   │   └── location.proto
│   └── weather
│   ├── hurricanes.proto
│   └── weather.proto
├── mobile_svc
│   └── mobile_svc.proto
└── weatherman_svc.proto
```

`list` returns
```
desktop.Desktop
grpc.reflection.v1alpha.ServerReflection
mobile.Mobile
weatherman.Weatherman
```
`weatherman.Weatherman.Healthcheck` returns
```
{
"healthy": true
}
```

`list mobile.Mobile` throws an error
```
Failed to list methods for service "mobile.Mobile": Symbol not found: mobile.Mobile
caused by: File not found: location/location.proto
```

I'd like to avoid refactoring the packages (which does work, but I have to flatten them) but I'd like to know of this is a symptom of how I have the packae imports, the gRPC reflection service, or the reflection in `grpcurl` itself.

My feeling though, is that if the protos compile, the server compiles, the reflection service should have enough information to define the types. Any feedback is appreciated.

Edit: just for posterity, building the protosets and using those with grpcurl does work.