Type generation for dictionary

I have the following type in a DTO which was previously a List<ProductData>:

public Dictionary<string, ProductData[]> Products { get; set; }

When generating the typescript type definitions (/types/typescript) I have the following diff:

As you can see, the ProductData class is now not being generated. How do I get it to be generated again?

Do you ProductData referenced anywhere else?

This should be resolved from this commit which is now available from v5.1.1 on MyGet.