Crash report: `Error: Unsupported chain ID`

URL

https://app.uniswap.org/#/pool/264735?chain=mainnet

Error

Error: Unsupported chain ID

Stacktrace

Error: Unsupported chain ID
    at n.get (https://app.uniswap.org/static/js/main.8c9f966b.chunk.js:1:535062)
    at cp (https://app.uniswap.org/static/js/main.8c9f966b.chunk.js:1:344389)
    at sf (https://app.uniswap.org/static/js/2.365a8d52.chunk.js:2:2442916)
    at Vf (https://app.uniswap.org/static/js/2.365a8d52.chunk.js:2:2452483)
    at Ya (https://app.uniswap.org/static/js/2.365a8d52.chunk.js:2:2496207)
    at Cs (https://app.uniswap.org/static/js/2.365a8d52.chunk.js:2:2482457)
    at Ts (https://app.uniswap.org/static/js/2.365a8d52.chunk.js:2:2482385)
    at Os (https://app.uniswap.org/static/js/2.365a8d52.chunk.js:2:2482248)
    at ws (https://app.uniswap.org/static/js/2.365a8d52.chunk.js:2:2479214)
    at https://app.uniswap.org/static/js/2.365a8d52.chunk.js:2:2428708

Device data

{
  "ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36",
  "browser": {
    "name": "Chrome",
    "version": "103.0.0.0",
    "major": "103"
  },
  "engine": {
    "name": "Blink",
    "version": "103.0.0.0"
  },
  "os": {
    "name": "Mac OS",
    "version": "10.15.7"
  },
  "device": {},
  "cpu": {}
}

Start by reproducing the mainnet pool URL and tracing the Unsupported chain ID error through the referenced JavaScript bundles and stacktrace. Done means the pool page loads without this crash for the reported URL, with any relevant regression coverage identified during investigation.