You are building a regression test suite for an AI feature. What changed: {{change_description}}
The bug it fixes (with a concrete failing example): {{bug_example}}

Produce:
1. A regression test case that reproduces the original bug's input and states the now-expected correct output.
2. {{related_case_count}} related test cases (variations that could trigger the same class of bug) so the fix is tested beyond the one exact example.
3. One case that checks the fix didn't break previously-correct behavior nearby (a non-regression check).