[Issue] attempting to change value of a read-only property

[gofeel8]

What

I found an error where the webview service using polyfill.io It was an issue of 'attempting to change value of a read-only property' I think it insert the polyfill code even though I have a Symbol.asyncIterator

This is my useragent in the environment where the issue occurred

Details

Command the curl below at the terminal, can see that the user agent is parsed

curl -XGET "https://polyfill.io/v3/polyfill.min.js?features=es2018" \
   -H "User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148" -v

This User-Agent Header's safari version 11 right?