Unable to build AMD bundles with externals from npm thin packages

[SergeyMaltsev]

Forum post

Most likely the problem is that Rollup fails while resolving existing Circular dependencies in our code and that causes bryntum-grid-thin.js includes @bryntum/core-thin code inside and this finally shows the initial Runtime error with

 The Bryntum Grid bundle was loaded multiple times by the application

Need to resolve all Circular dependencies and check if that helps.
The same would probably happen if we use rollup with Bryntum sources.

Reproduce

The very basic app with rollup is attached:

amd-build.zip

npm i
npx rollup --config rollup.amd.mjs

Result: bryntum-grid-thin.js includes @bryntum/core-thin code instead of including it externally from bryntum-core-thin.js