See symfony/symfony#28902

Basically enables adding methods to interfaces in an upcoming major. Not declaring real methods for @method annotations will trigger a deprecation in the current major.

• the vendor should depend on a method_exists() check in the current major, providing a fallback in case the consumer object is not yet upgraded
• the vendor should declare the real interface method in the upcoming major, removing the @method annotation and method_exists check at this point
• the consumer should fix deprecation before upgrading, not doing so will hard cause a hard crash due the above changes by the vendor

I think it should be added to https://symfony.com/bc also

The detected signature, per phpdoc3, is:

@method [[static] return type] [name]([[type] [parameter]<, ...>]) [<description>]