What happened?

The Delete For Site behavior appears to be inconsistent with respect to soft-/hard-deletion:

• If I delete an entry that is only enabled in one site, the entry is soft-deleted and appears in Trashed.
• If I delete a multi-site-enabled entry that is currently only active on one site, the entry is soft-deleted and appears in Trashed.
• If I delete a multi-site-enabled entry that is currently active on multiple sites, the entry (for that site) is hard-deleted and cannot be restored.

This behavior is confusing; It feels like a bug.

As a content editor, I would expect that, if soft-deletes are enabled for entries, an entry I delete from a site should be recoverable from Trashed, no matter how many sites it's active in at the time of deletion.

Steps to reproduce

1. Accidentally Delete-For-Site an entry that is only enabled in one site. See that you can restore the entry from Trashed.
2. Accidentally Delete-For-Site an entry that is enabled in multiple sites. See that it's irrecoverably gone. Cry. 😢

Craft CMS 4.5.3
PHP 8.1.20
MySQL 8.0