Following instructions on https://doc.ezplatform.com/en/latest/tutorials/platform_beginner/3_customize_the_front_page/

Adding a new entry into webpack.config.js leads to the following error if cache was not cleared:

This is caused by a cache service being injected into Encore due to our configuration defaults being reversed:

Switching to Symfony defaults fixes the issue.

This would probably also make the mention of clearing cache in those particular docs optional if not obsolete.