Declaration file generation not working as expected

TypeScript Version: 4.0.0-dev.20200429 (when trying with @next)
TypeScript Version: 3.8.0.0-dev.20200429 (when using my version ^3.8.0)

Search Terms: module resolution, lerna, monorepo, import type, declaration file

Code
Repository https://github.com/Volox/tsc-declaration-issue

To bootstrap and run:

npx lerna bootstrap
npx lerna run compile

Expected behavior: The declaration files generated are only related to the package.

Actual behavior: The declaration files are generated correctly only for lib1 and lib2 have the full tree of declaration files of both packages.

Related Issues: None that I was able to find

Notes:
The generation of declaration files is done correctly if I remove the "paths" property from tsconfig.base.json but I receive compilation errors like:

src/index.ts(1,19): error TS2307: Cannot find module 'lib1'.
src/index.ts(3,24): error TS2307: Cannot find module 'lib1/foo/bar'.

Usa il repository collegato Volox/tsc-declaration-issue ed esegui prima npx lerna bootstrap, seguito da npx lerna run compile. Confronta le dichiarazioni generate per lib1 e lib2 con e senza la proprietà paths in tsconfig.base.json, verificando anche gli errori di risoluzione dei moduli segnalati. L'attività è completata quando ogni pacchetto emette esclusivamente il proprio albero di dichiarazioni senza questi errori.