TypeError: Cannot add property __gohashid, object is not extensible

[drenther]

Error description

Error when making any changes in the inspector or toggling relink input and then interacting with the diagram canvas again.

Steps to reproduce

Took the liberty of using this repo as a template in codesandbox - https://codesandbox.io/s/github/NorthwoodsSoftware/gojs-react-basic

[jonchardy]

I see the problem in CodeSandbox, but I'm unable to reproduce it outside that environment. Do you have the same problem if you download the repo and install/run?

[drenther]

No. That's very weird. Thanks for responding so quickly. Might be some issue with how codesandbox handles updates.