What is the URL of the page with the issue?
https://go.dev/play/p/Z0qYLaaDzyL
What is your user agent?
[Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36](https://developers.whatismybrowser.com/useragents/parse/?analyse-my-user-agent=yes)
That was Chrome, but the same bug was observed with Firefox.
Screenshot

What did you do?
Open https://go.dev/play/p/Z0qYLaaDzyL in my web browser
What did you expect to see?
No error
What did you see instead?
prog.go:1:1: expected 'package', found Loading
Go build failed.
More info
This does not seem specific to my browser (tried 2 browsers).
This does not seem specific to my snippet URL (tried other snippets, e.g. https://go.dev/play/p/2DClKGAIhmz ).
The problem occurs as soon as the web page loads, before I do any action.
Subsequently clicking the [Run] button works fine.
What is the URL of the page with the issue?
https://go.dev/play/p/Z0qYLaaDzyL
What is your user agent?
That was Chrome, but the same bug was observed with Firefox.
Screenshot
What did you do?
Open https://go.dev/play/p/Z0qYLaaDzyL in my web browser
What did you expect to see?
No error
What did you see instead?
More info
This does not seem specific to my browser (tried 2 browsers).
This does not seem specific to my snippet URL (tried other snippets, e.g. https://go.dev/play/p/2DClKGAIhmz ).
The problem occurs as soon as the web page loads, before I do any action.
Subsequently clicking the [Run] button works fine.