Navigation (beta):The "Copy existing menu" feature causes the block to crash

[mrfoxtalbot]

Description

While using the Navigation (beta) feature, trying to use the "Copy existing menu" feature causes the block to crash.

It returns this error:

This block has encountered an error and cannot be previewed

Step-by-step reproduction instructions

1. With Gutenberg Version 12.2.0 active, head to the Navigation (beta) section at wp-admin/admin.php?page=gutenberg-navigation.

2. Click on Copy existing menu and select an existing menu.

Screenshots, screen recording, code snippet

Environment info

• WordPress 5.8.2 running Twenty Nineteen theme.
• Gutenberg plugin version 12.2.0.
• No other active plugins.

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[kathrynwp]

Closing this issue due to the Navigation Screen project being moved to an inactive status on the feature projects page in coordination with the project leads. (The developer documentation in the initial post are no longer accessible)

If this work is picked back up, issues can be revisited and reopened as needed. Thanks for pitching in on this early feature so the wider WordPress project could benefit from the lessons learned!