Previously published npm packages are being overwritten by the publish tool

The publish tool should not be overwriting previously published packages.
https://docs.npmjs.com/policies/unpublish
Overwriting published packages is against npm's policy, and I'm not sure how this was even possible because the npm registry should be immutable.

Our stable CI pipeline has failed to build since this PR was merged
https://github.com/DefinitelyTyped/DefinitelyTyped/commit/5f1a94967148173f78ff00792c29ef5f2a1a3edb

We are using @types/react-redux 7.1.16. That npm package was originally published 9 months ago, but overwritten 6 days ago.
https://www.npmjs.com/package/@types/react-redux/v/7.1.16

I started looking into some of the other packages that would have been affected by that same PR.
https://www.npmjs.com/package/@types/chai-enzyme/v/0.6.7
https://www.npmjs.com/package/@types/emoji-mart/v/3.0.4
https://www.npmjs.com/package/@types/enzyme/v/3.10.8

All @types packages affected by the above PR have their previously published npm packages overwritten 6 days ago.

Start by reviewing the publish tool and the referenced commit 5f1a94967148173f78ff00792c29ef5f2a1a3edb, then compare the affected package versions listed in the issue. Reproduce the stable CI failure if possible; done means previously published packages are not overwritten and the stable pipeline builds successfully.