Unable to annotate images. Smart Select works but class picker never appears, "Find Objects with AI" fails

Symptoms:
Smart Select can successfully highlight/segment an animal.
After the segmentation is created, the class picker never appears, so we cannot assign a class (cow, sheep, goat, etc.).
“Find Objects with AI” consistently returns “Failed to Find Objects”.
Browser network requests appear to return only 200/204 responses (no obvious errors).
The project classes are still present.
This project previously supported pixel annotation and has hundreds of successfully annotated images.
Troubleshooting attempted:
Hard refresh
Log out/log back in
Incognito/private browsing
Different browsers
Testing multiple images
Testing multiple users on the project
Has anyone seen this behavior before, or is there a known issue that could cause Smart Select to segment objects but never allow class assignment?
Thanks!

  • Project Type: Object Detection. Classification
  • Operating System & Browser: Chrome & Safari
  • Project Universe Link or Workspace/Project ID: world-bank-cownt
  • Do you grant Roboflow Support permission to access your Workspace for troubleshooting? (Yes/No): Yes