Module Not Found Error

Love using Formik, thanks for building it :)

I wanted to user formover, but I'm getting this error when I try to import it.

```
./node_modules/formover/dist/index.js
Module not found: `./node_modules/formover/dist/Formover.js` does not match the corresponding path on disk `formover.js`.
```
It works with npm but not yarn

Start by inspecting node_modules/formover/dist/index.js and the packaged Formover.js path mentioned in the error, then compare how the package is resolved by npm versus Yarn. Confirm the fix by importing formover through Yarn without the module-not-found error.

Written by the indexing model from the issue text.