erroneous failure on resource pattern not alternating

getting the following:

```
example/bookstore/v1/bookstore.proto:297:3:Resource pattern "publishers/{publisher}/books/{book}/editions/{book-edition}" must alternate between collection and identifier. "{book-edition}" is not an identifier (buf-plugin-aep)
```
This resource pattern is valid, and matches the OAS example. I think aip required underscores, which could be the issue?