GraphQL: Null value resolved for non-null field subgraphFeatures

[tilacog]

ERROR (IndexerAgent/1560869): Failed to query subgraph features from indexing statuses endpoint
    component: "GraphNode"
    subgraphId: "QmWC8bGoqBRmiAwMRVA983CmhC4j3gMPmkM2p3F2rM35NX"
    err: {
      "type": "IndexerError",
      "message": "Failed to query subgraph features from indexing statuses endpoint",
      "stack":
          IndexerError: Failed to query subgraph features from indexing statuses endpoint
              at indexerError (/home/ubuntu/node/lib/node_modules/@graphprotocol/indexer-agent/node_modules/@graphprotocol/indexer-common/dist/errors.js:173:12)
              at GraphNode.<anonymous> (/home/ubuntu/node/lib/node_modules/@graphprotocol/indexer-agent/node_modules/@graphprotocol/indexer-common/dist/graph-node.js:569:55)
              at Generator.next (<anonymous>)
              at fulfilled (/home/ubuntu/node/lib/node_modules/@graphprotocol/indexer-agent/node_modules/@graphprotocol/indexer-common/dist/graph-node.js:5:58)
              at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
      "code": "IE073",
      "explanation": "https://github.com/graphprotocol/indexer/blob/main/docs/errors.md#ie073",
      "cause": {
        "type": "CombinedError",
        "message": "[GraphQL] Null value resolved for non-null field `subgraphFeatures`",
        "name": "CombinedError",
        "graphQLErrors": [
          {
            "message": "Null value resolved for non-null field `subgraphFeatures`"
          }
        ],
        "response": {
          "size": 0,
          "timeout": 0
        }
      }
    }

Initially posted by @hakai-here in #807