Redoc.init callback not working on error

Describe the bug
Callback function registered on Redoc.init is not called on error while rendering redoc.

Redoc.init(
  event.data,
  config,
  document.getElementById('redoc-container'),
  callback ---> doesn't seem to be called.
);

If something's wrong in my code, please tell me how to apply callback function on error.

Expected behavior
Callback function should be called on error.

Minimal reproducible OpenAPI snippet(if possible)

Screenshots

Additional context
Add any other context about the problem here.

Start at the Redoc.init entry point and trace the rendering error path to see where the callback is skipped. Reproduce the reported error, add coverage for the error case, and confirm that the callback is invoked when rendering fails.