index.js:1 TypeError: Cannot read properties of undefined (reading 'r')

[akashshyamdev]

Here's the error I get while loading a custom scene.json.

index.js:1 TypeError: Cannot read properties of undefined (reading 'r')
at t.e.copy (three.min.js:2)
at t.Xs.copy (three.min.js:2)
at t.r.copy (index.js:1)
at Function.t.fromJSON (index.js:1)
at t.customParseMaterials (index.js:1)
at t.parse (index.js:1)
at index.js:1

I think spline has updated something in the scene.json generation and now the code's broken.