[Bug] Anthropic API Error: Content filtering blocks benign state dropdown feature request

Bug Description
Got "API Error: Output blocked by content filtering policy" on second benign prompt on a small, clean project. Consistently reproducible! Prompt just says to change an HTML text field for "State" to a dropdown of all 50 states.

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.137
• Feedback ID: cd91b2ef-6591-442f-98e5-07b340671117
• Model: Opus 4.7, but I also reproduced this with Sonnet

First prompt in a directory that has only a brand new empty git repo and nothing else: "Make a simple web page with a submission form with text address fields: name, addr1, addr2, city state zip, country"

Second prompt: "Make "State" a dropdown with all 50 states. (We do not need to support anything other than the 50 states.)"

Result: "API Error: Output blocked by content filtering policy"