Fallback should work with transition

Editor assessment

The subject states the defect and the combination that breaks it exactly — the Suspense fallback fails when wrapped in a transition — so the header communicates the bug and its trigger without the diff, and fix(Suspense) classifies and locates it at the component in question, the capitalized proper name being an acceptable scope. The fix #3963 footer is well formed and ties the change to its report. No body is needed since the footer supplies the issue context. Hygiene is clean. Clear, accurate, and properly referenced: a good, publishable example.