fix: collections in react canary & next 16 app router

[nwidynski]

Closes #10298

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[nwidynski]

@LFDanLu Next 16 app router uses React Canary, which is why this wasn't replicable in test. The bug itself was due to react/react#35091, which is landing in React 19.3+. Lmk what you think about this approach.