link https://symfony.com/doc/current/doctrine.html#fetch-automatically
The documentation says

This behavior is enabled by default on all controllers. If you prefer, you can restrict this feature to only work on route wildcards called id to look for entities by primary key. To do so, set the option doctrine.orm.controller_resolver.auto_mapping to false.

When running the command symfony new --webapp --version="7.1.*", the auto_mapping is disabled by default, although according to the documentation, it should be enabled.