I found an issue with cartLines on OSP where selected option name is always “Option”.
Incorrect option name “Option” on OSP
Correct option name “Title” on TYP and in checkout
I’m using following packages. Tested both in dev mode and released.
"@shopify/ui-extensions": "2025.1.0",
"@shopify/ui-extensions-react": "2025.1.0",
"react": "^18.3.1"