Getting an error while using MultiSelectOptionSet

[iamvimals]

Current versions:
pcf-scripts: 1.32.5
pcf-start: 1.32.5

I'm currently building a PCF control that uses a MultiSelectOptionSet property.

So, I have added a new property in ControlManifest.Input.xml as shown below:

With this, if I run the following command: pcf-scripts refreshTypes, I'm getting the below error, and the ManifestTypes.d.ts files does not contain the updated input/output properties:

So upon further investigating, I'm thinking that this code here in manifestTypesGenerator.js could be the crux of this problem.

Not exactly sure why this condition is different from the ones above it. So any help with this is greatly appreciated, and I'm also happy to provide any further context if needed.

Thanks