Allowing unrequired lists in graphql

type Participants @entity(immutable: true) {
  id: String!
  games: [Games] # array of games they are a part of
}

this returns the error

  Participants:
  - Field 'games':
  Field has type [Games] but
  must have type [Games!]
  
  Reason: Lists with null elements are not supported.

see in my contract when a participant in initialized he necessarily is not a part of any game so i want the games field to be empty, i have seen this syntax on GitHub and it works for those projects i don’t know why this syntax isn’t working here.

for reference: specVersion: 0.0.5