cycle case when using computed + getRoot

[marbemac]

Basically it seems that computeds that use getRoot and attempt to access observables that no longer exist can run into a cycle error? TBH I'm not sure, but I've got a reproduction. Note that this error is only visible if the mobx disableErrorBoundaries option is set to true.

Reproduction: https://github.com/marbemac/mobx-keystone-circular-error (instructions to run in the readme).

• the store(s): https://github.com/marbemac/mobx-keystone-circular-error/blob/main/app/stores.ts
• the page that uses them: https://github.com/marbemac/mobx-keystone-circular-error/blob/main/app/routes/index.tsx