Source code was not found for

Hi, after update to newer Sentry client we keep getting error

Source code was not found for

I maintain various projects and haven’t seen this error anywhere else, so I assume it might be something with server config. But the errors are sent from browser client and it says it can’t find source code for Sentry client itself, which is hosted on different domain. If I understand it correctly, Sentry is uploading source files on error and for some reason it fails to send it’s own source code. Or there is a bug in Sentry server.
Do you have any idea why this might be happening?
Thanks for help

EDIT: We are using @sentry/webpack-plugin to upload source maps. Everything seems to be working fine except this error in hosted Sentry UI.

Can you please share a link to the actual event in sentry?

Nevermind, sorry, I found it. We had Enable JavaScript source fetching disabled in config. It must have been disabled for a long time, but for some reason there wasn’t a problem with old client