wrangler >=4.131.1 changed what `deployed trigger output` does. Wrangler now prefixes explicit custom domain production states with production: in deployed trigger output, so the labels match Preview labels. Silent: code written for older versions still runs, without an error.

const fs = require("fs");
function symptom(msg) { console.error("FAIL: " + msg); process.exit(1); }
function broken(msg) { console.error("ERROR: " + msg); process.exit(2); }
const src = fs.readFileSync("/w/node_modules/wrangler/wrangler-dist/cli.js", "utf8");
const a = src.indexOf("function renderRoute(");
if (a < 0) broken("renderRoute not found");
const b = src.indexOf("\n}\n", a);
if (b < 0) broken("end of renderRoute not found");
let render;
try { render = new Function(src.slice(a, b + 3) + "\nreturn renderRoute;")(); } catch (e) { broken("cannot load renderRoute: " + e.message); }
const on = render({ pattern: "example.com", custom_domain: true, enabled: true });
const off = render({ pattern: "example.com", custom_domain: true, enabled: false });
if (!on.includes("enabled") || !off.includes("disabled")) broken("unexpected labels: " + on + " | " + off);
if (on !== "example.com (custom domain) [production: enabled]" || off !== "example.com (custom domain) [production: disabled]") symptom("custom domain labels are " + on + " and " + off + " without the production: prefix");
console.log("OK: " + on + " | " + off);

const fs = require("fs");
function symptom(msg) { console.error("FAIL: " + msg); process.exit(1); }
function broken(msg) { console.error("ERROR: " + msg); process.exit(2); }
const src = fs.readFileSync("/w/node_modules/wrangler/wrangler-dist/cli.js", "utf8");
const a = src.indexOf("function renderRoute(");
if (a < 0) broken("renderRoute not found");
const b = src.indexOf("\n}\n", a);
if (b < 0) broken("end of renderRoute not found");
let render;
try { render = new Function(src.slice(a, b + 3) + "\nreturn renderRoute;")(); } catch (e) { broken("cannot load renderRoute: " + e.message); }
const on = render({ pattern: "example.com", custom_domain: true, enabled: true });
const off = render({ pattern: "example.com", custom_domain: true, enabled: false });
if (!on.includes("enabled") || !off.includes("disabled")) broken("unexpected labels: " + on + " | " + off);
if (on !== "example.com (custom domain) [production: enabled]" || off !== "example.com (custom domain) [production: disabled]") symptom("custom domain labels are " + on + " and " + off + " without the production: prefix");
console.log("OK: " + on + " | " + off);