UI Delete Aggregation Groups: cursor disappeared after delete 1 dimension

STEPS:
1. Login
2. Create cube
3. Go to "Aggregation Groups" step
4. Place cursor in aggregation group input
5. Press "Delete" button once to delete 1 dimension
6. Press "Delete" button again to delete another dimension

RESULT:
Page goes back. As at step 6, curser is no longer in aggregate input.