I just tried upgrading from v2.3.0.beta3 +2 to 2.3.0.beta4 and everything seemed to go ok. Except icons and other theme components didn’t appear to load correctly.
I checked Inspect Element and it showed the following issue. I’m not sure if that’s the route of the cause or a symptom of the main issue. I’ve had to rollback the server for the time being to avoid disruption to members. I’m hoping someone can offer some insight.
Yes, there was a similar error after the update.
This update was made:
https://github.com/discourse/discourse/compare/7310ee3...243fb8d
https://github.com/discourse/discourse-solved/commit/e9be43becd3630eeb05f81ee3c0149bf62e70bec
I’ve not replicated this, but it does look like it might be a bug.
Yes, like @Stranik mentioned this commit is the reason for your problem. It’s depending the other commit from core which is not yet available in the “tests-passed” branch. You have to upgrade the core once it is available. I’m going to revert this feature for now.
Thank you! 
Nothing wrong.
