"Could not find module errors" at runtime for some packages

I’m working on a project using Ember 3.27.2 that is included as part of a Chrome extension. When running the application I’m seeing errors when the app tries to use certain modules.

• prop-types (used by ember-arg-types)
• intersection-observer-admin (used by ember-in-viewport/-private/observer-admin in ember-infinity)
• local-time (referenced directly within one of the components)

The errors all look something like this:

Uncaught (in promise) Error: Could not find module `intersection-observer-admin` imported from `ember-in-viewport/-private/observer-admin`
    at missingModule (vendor.js:259)
    at findModule (vendor.js:270)
    at Module.findDeps (vendor.js:180)
    at findModule (vendor.js:274)
    at Module.findDeps (vendor.js:180)
    at findModule (vendor.js:274)
    at Module.findDeps (vendor.js:180)
    at findModule (vendor.js:274)
    at requireModule (vendor.js:36)
    at Class._extractDefaultExport (vendor.js:129821)

I stuck a breakpoint into findModule so that I could look at the registry array. The modules referenced above are indeed missing from registry. I’ve searched through vendor.js and I do see references to prop-types, etc.

Does anybody know why those modules would be left out of the build or not show up in registry?

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