[BUG] Output blocked by content filtering policy despite no copyrighted content

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

The api seems to think this function is copyright infringement of some sort

This is simply listing out japanese characters and their pronunciations but whenever claude code tries to copy/write this function i get the api error:

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Output blocked by content filtering policy"},"request_id":null}

What Should Happen?

No error should happen, the error is a false positive

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Output blocked by content filtering policy"},"request_id":null}

Steps to Reproduce

Write to a file:

fn kana_romaji(glyph: &str) -> &'static str {
    match glyph {
        "あ" | "ア" => "a",
        "い" | "イ" => "i",
        "う" | "ウ" => "u",
        "え" | "エ" => "e",
        "お" | "オ" => "o",
        "か" | "カ" => "ka",
        "き" | "キ" => "ki",
        "く" | "ク" => "ku",
        "け" | "ケ" => "ke",
        "こ" | "コ" => "ko",
        "さ" | "サ" => "sa",
        "し" | "シ" => "shi",
        "す" | "ス" => "su",
        "せ" | "セ" => "se",
        "そ" | "ソ" => "so",
        "た" | "タ" => "ta",
        "ち" | "チ" => "chi",
        "つ" | "ツ" => "tsu",
        "て" | "テ" => "te",
        "と" | "ト" => "to",
        "な" | "ナ" => "na",
        "に" | "ニ" => "ni",
        "ぬ" | "ヌ" => "nu",
        "ね" | "ネ" => "ne",
        "の" | "ノ" => "no",
        "は" | "ハ" => "ha",
        "ひ" | "ヒ" => "hi",
        "ふ" | "フ" => "fu",
        "へ" | "ヘ" => "he",
        "ほ" | "ホ" => "ho",
        "ま" | "マ" => "ma",
        "み" | "ミ" => "mi",
        "む" | "ム" => "mu",
        "め" | "メ" => "me",
        "も" | "モ" => "mo",
        "や" | "ヤ" => "ya",
        "ゆ" | "ユ" => "yu",
        "よ" | "ヨ" => "yo",
        "ら" | "ラ" => "ra",
        "り" | "リ" => "ri",
        "る" | "ル" => "ru",
        "れ" | "レ" => "re",
        "ろ" | "ロ" => "ro",
        "わ" | "ワ" => "wa",
        "を" | "ヲ" => "wo",
        "ん" | "ン" => "n",
        "が" | "ガ" => "ga",
        "ぎ" | "ギ" => "gi",
        "ぐ" | "グ" => "gu",
        "げ" | "ゲ" => "ge",
        "ご" | "ゴ" => "go",
        "ざ" | "ザ" => "za",
        "じ" | "ジ" => "ji",
        "ず" | "ズ" => "zu",
        "ぜ" | "ゼ" => "ze",
        "ぞ" | "ゾ" => "zo",
        "だ" | "ダ" => "da",
        "ぢ" | "ヂ" => "ji",
        "づ" | "ヅ" => "zu",
        "で" | "デ" => "de",
        "ど" | "ド" => "do",
        "ば" | "バ" => "ba",
        "び" | "ビ" => "bi",
        "ぶ" | "ブ" => "bu",
        "べ" | "ベ" => "be",
        "ぼ" | "ボ" => "bo",
        "ぱ" | "パ" => "pa",
        "ぴ" | "ピ" => "pi",
        "ぷ" | "プ" => "pu",
        "ぺ" | "ペ" => "pe",
        "ぽ" | "ポ" => "po",
        "きゃ" | "キャ" => "kya",
        "きゅ" | "キュ" => "kyu",
        "きょ" | "キョ" => "kyo",
        "しゃ" | "シャ" => "sha",
        "しゅ" | "シュ" => "shu",
        "しょ" | "ショ" => "sho",
        "ちゃ" | "チャ" => "cha",
        "ちゅ" | "チュ" => "chu",
        "ちょ" | "チョ" => "cho",
        "にゃ" | "ニャ" => "nya",
        "にゅ" | "ニュ" => "nyu",
        "にょ" | "ニョ" => "nyo",
        "ひゃ" | "ヒャ" => "hya",
        "ひゅ" | "ヒュ" => "hyu",
        "ひょ" | "ヒョ" => "hyo",
        "みゃ" | "ミャ" => "mya",
        "みゅ" | "ミュ" => "myu",
        "みょ" | "ミョ" => "myo",
        "りゃ" | "リャ" => "rya",
        "りゅ" | "リュ" => "ryu",
        "りょ" | "リョ" => "ryo",
        "ぎゃ" | "ギャ" => "gya",
        "ぎゅ" | "ギュ" => "gyu",
        "ぎょ" | "ギョ" => "gyo",
        "じゃ" | "ジャ" => "ja",
        "じゅ" | "ジュ" => "ju",
        "じょ" | "ジョ" => "jo",
        "びゃ" | "ビャ" => "bya",
        "びゅ" | "ビュ" => "byu",
        "びょ" | "ビョ" => "byo",
        "ぴゃ" | "ピャ" => "pya",
        "ぴゅ" | "ピュ" => "pyu",
        "ぴょ" | "ピョ" => "pyo",
        _ => "",
    }
}

and ask claude code to write this function to another file manually

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.76

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_