Copy/Paste Feature: "Invalid clipboard item - Referenced document does not exist" when copying sections with references

[milewskibogumil]

Bug: Copy/Paste Feature Fails for Referenced Fields Collections

Describe the bug
The new copy/paste feature for schemas fails when trying to copy sections containing referenced fields, specifically when the reference is a collection of items (like FAQs). The error occurs even though the referenced documents exist in the dataset.

To Reproduce

1. Create a section with referenced fields (e.g., FAQ section referencing a collection of FAQ items)
2. Try to copy the section using the new copy/paste feature
3. Attempt to paste the section
4. Receive error toast: "Invalid clipboard item. The referenced document '[ID]' does not exist"

Expected behavior
The section should copy and paste successfully, maintaining the references to the existing FAQ items.

Error Screenshot

Sanity Versions

@sanity/cli (global)                   3.54.0 (latest: 3.68.3)
@sanity/document-internationalization   3.3.0 (up to date)
@sanity/eslint-config-studio            5.0.1 (up to date)
@sanity/vision                         3.68.3 (up to date)
sanity                                 3.68.3 (up to date)

Additional context

• Verified through Vision tab with GROQ that the referenced document IDs exist in the dataset
• Current workaround: None identified

Environment:

• Node.js version: v21.4.0
• bun version: 1.1.26
• OS: macOS Sequoia (Version 15.1.1)