[BC Break][7.4] ClassNotFoundError for optional interfaces

[ro0NL]

Symfony version(s) affected

7.4.0

Description

Hi,

We're loading services using resource: '../vendor/path/to/src'

This breaks in 7.4 for classes which implement an unknown (ie. optional) interface.

How to reproduce

#[AsAlias(OptionalInterface::class)]
final class Some implements OptionalInterface {}

Possible Solution

No response

Additional Context

No response

[ro0NL]

maybe related to #62545

will wait for a patch release 👍