@interfaceObject example doesn't work

[jhanggi]

Issue Description

I was having trouble composing my schema with @interfaceObject, and what I had is almost identical to the example provided.

See my reproduction https://github.com/jhanggi/apollo-interface-obj-bug

I get the same errors there, and what's particularly weird is different errors between rover supergraph compose and rover dev

Any ideas?

Running rover 0.22.0

⌛ resolving SDL for subgraphs defined in ./supergraph.yml
🎶 composing supergraph with Federation v2.3.2
HINT: [INCONSISTENT_INTERFACE_VALUE_TYPE_FIELD]: Field "Media.title" of interface type "Media" is defined in some but not all subgraphs that define "Media": "Media.title" is defined in subgraph "graph-a" but not in subgraph "graph-b".
HINT: [INCONSISTENT_INTERFACE_VALUE_TYPE_FIELD]: Field "Media.reviews" of interface type "Media" is defined in some but not all subgraphs that define "Media": "Media.reviews" is defined in subgraph "graph-b" but not in subgraph "graph-a".

I thought the whole point of @interfaceObject was that different subgraphs could contribute different fields to an interface.

It appears as if it does successfully generate a schema, though.

Rover dev has a different problem (besides the fact it is ignoring the federation version in supergraph.yml):

> rover dev --supergraph-config ./supergraph.yml
⚠️  Do not run this command in production! ⚠️  It is intended for local development.
🛫 starting a session with the 'graph-b' subgraph
🛫 starting a session with the 'graph-a' subgraph
🎶 composing supergraph with Federation v2.6.1
error[E029]: Encountered 1 build error while trying to build a supergraph.

Caused by:
    INTERFACE_OBJECT_USAGE_ERROR: Type "Media" is declared with @interfaceObject in all the subgraphs in which is is defined (it is defined in subgraph "graph-b" but should be defined as an interface in at least one subgraph)

Link to Reproduction

https://github.com/jhanggi/apollo-interface-obj-bug

Reproduction Steps

No response

[jhanggi]

In my application, I found that the rover dev, the supergraph does still spin up even with the INTERFACE_OBJECT_USAGE_ERROR, and everything seems to resolve correctly.

[jhanggi]

I found that if I update the federation_version to 2.6 in the supergraph.yml, it works with rover supergraph compose, but still doesn't work with rover dev