Joomla 4 issue preparing content

I don't know what to suggest. I've never had such an issue. If you can upload your site to a live domain and confirm the issue persists there I can investigate further from there, but there's nothing I can really suggest for a localhost environment as they are often wildly different from a live site unless you're in a standardized docker environment. It's entirely possible there's just some weird server configuration going on.

Aside, I never enabled the Content - Community Builder Replacer plugin. That shouldn't matter, should it?

Unpublished plugins don't do anything.

Very odd! I can not replicate the problem in Chrome, Palemoon, Opera, or Android. Why would J4 be serving a different page to Firefox?

I posted to the Joomla 4 forum with my FPA. It gave me an "A" for compatible.

Very odd! I can not replicate the problem in Chrome, Palemoon, Opera, or Android. Why would J4 be serving a different page to Firefox?

I have no idea. I can't possibly see how this would be browser dependent.

I posted this problem in the Joomla 4 forum and someone noticed "live_site" in my configuration was not empty. It's funny we were talking about that in my other post (formatname...). In production, I do have it empty but I didn't in my test environment. 

However, changing it to empty seems to have made no difference...

I just updated to Joomla 4.3.3 and it seems to have fixed both the disappearing images in JEvents and the missing CBGallery substitutions.

Funny they would wait until days before J3 EOL for this major fix!