Problems with Intellisense with Yarn (berry) 2 PnP and Typescript (Webstorm 2020.2.2)

Questions in bold.

• Webstorm (tried 2020.2.2 and 2020.2.3RC) on Windows 10 x64
• Webstorm should support Yarn 2 and PnP since 2019.3+
• Is it necessary to do a yarn pnpify? There is no mention in the documentation, seems only to be necessary for VsCode and other editors, not for Webstorm.

1. Reset Webstorm settings
2. Yarn 1 was installed globally
3. Select yarn package manager
4. Create new React App (TypeScript)
   
5. Check everything works with yarn start
6. Switch to Yarn 2 with:
   > yarn set version berry
   (see https://yarnpkg.com/getting-started/install)
7. Reinstall packages with:
   > yarn install
8. Yarn 2 PnP is now active, node_modules folder is empty (except some babel and eslint cache files). Settings now show correct Yarn 2 version is used:
   
9. Check everything works again with yarn start
10. Webstorm Intellisense seems to be troubled (maybe because node_modules folder was deleted), look at App.tsx:
    
    
    The Typescript compiler shows many errors:
    
    
    Restarting the Typescript service seems to fix this.
    Is this the only way to fix this?
11. Checking settings in Languages & Frameworks/Typescript seems ok:
    
12. Intellisense for React works:
    
13. Now, trying to import lodash
    
    
    I expected to be offered to automatically install the new dependency
14. Installing npm module manually:
    > yarn add lodash
15. After I installed lodash, the IDE shows this:
    
    
    Webstorm seems to have detected a change in package.json (through the “yarn add lodash”) and offers to run yarn install.
    But that seems unnecessary, yarn add already installed the dependencies
    Just to be sure, I issued an yarn install.
    The IDE still flags the import statement:
    
16. Restarting Typescript Service again fixes this.
    Is it necessary to always restart the Typescript Service for this?
17. Now I get the correct message that the type declarations are missing:
    
    
    I would have expected Webstorm to offer me an action to automatically yarn add @types/lodash for me
18. Installing type declarations for lodash manually:
    > yarn add @types/lodash
19. Again, have to restart typescript service manually
20. No errors flagged now in App.tsx
21. But Intellisense does not work for Lodash!:
    
22. If I try everything above with yarn 1 (I think npm will work also), Intellisense for lodash works fine.