D365EE | This page can't be displayed

While importing code into my local environment I was facing a strange behavior. All models build without errors. But when trying to open AX in the browser I got the message "This page can't be displayed"
So I checked the IIS, the services,... did an iisreset, but nothing changed.

After some checks in VisualStudio I called "synchronize database" and found the root cause for this issue. The DB sync threw an error that told me that there is a form extension with the same name in two different models.
And indeed that was the issue. I renamed one of the extensions build the modules and could open AX again. Table sync was working as well,

What I've learned from this is that the compiler is not checking if form extensions with the same name exist in different models. So always check that manually!
And what I still don't understand is why a synchronize database is throwing an error in form extensions. Shouldn't it focus on tables and table extensions?