entity version - scaffolding?

To resolve this issue, you need to add drupal/entity_version to the list of allowed packages for Drupal scaffold. Here's how you can do it:
Open the composer.json file located at the root of your Drupal project.

Look for the extra section within the composer.json file. If it doesn't exist, create it.

Within the extra section, locate or add the drupal-scaffold subsection. It might look something like this:

"extra": {
"drupal-scaffold": {
"allowed-packages": [
"drupal/core",
"drupal/core-composer-scaffold",
"drupal/entity_version"
]
}
}

But how do other modules do this?
Are they not required or do they add it automatically?

That is the D10 version I guess on my test machine - it states
"drupal-scaffold": {
"locations": {
"web-root": "web/"
}
},