AccountQueryInput GraphQL - error when using zkapp query variable

[jhult]

query AccountsQuery(
  $limit: Int = 100
  $sortBy: AccountSortByInput!
  $query: AccountQueryInput
) {
  accounts(limit: $limit, query: $query, sortBy: $sortBy) {
    publicKey
    username
    balance
    delegate
    nonce
    timeLocked
  }
}

Variables:

{
  "limit": 25,
  "sortBy": "BALANCE_DESC",
  "query": {
    "zkapp": false
  }
}

I get this error:

{
  "errors": [
    {
      "message": "Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
      "stack": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON"
    }
  ]
}

If you remove zkApp, it works fine.

[jhult]

Blocking Granola-Team/mina-block-explorer#1159