Runtime and dependencies

Note: one of the imported modules contains a duplicate key (expand the notebook2 value):

  id: "0afc32928f110b49"
  variables: 
    Array(2) [
      0: Object {
        name: "str0"
        value: ƒ()
      }
      1: Object {
        name: "str0"
        value: ƒ()
      }
    ]

and removing it solves the problem (see the notebook2_noDuplicate cell).

See the module file generated by Observable at: https://api.observablehq.com/d/8e5e6d7c80d7e3dd.js. It contains the duplicate variable.