Symfony version(s) affected

5.4.16, 6.0.16, 6.1.8, 6.2.0

Description

With the changes from #48027 empty tags get swallowed if a non-empty tag with the same name already exists. This causes issues because empty tags sometimes have a different meaning like with the container.service_subscriber tag.

The tag that gets set in

The container.service_subscriber tag has a different meaning if it is empty as we can see in:

How to reproduce

services:
    _instanceof:
        Some\Vendor\Interface:
            tags:
                - { name: container.service_subscriber, id: my.id }
                - { name: container.service_subscriber }

(the second tag does not get applied)

Possible Solution

Revert #48027 and solve #48019 differently.

Additional Context

No response