Fuelchain does not generate the correct type for OptionOutput<>

[matt-user]

What version of fuels-ts are you using?

0.16.0

Steps to Reproduce

I have a repro here.
Simply create a contract that has a function which returns an Option. And then generate the frontend types for the contract.

Expected Behavior

The generated type should contain information about the contained type such as struct fields etc. OptionOutput<bool | null>

Actual Behavior

The type generated is OptionOutput<[]>/