How many people who use Laravel actually have an understanding of raw PHP? (Or any other framework vs the raw language)

At my place of work we use Laravel daily. Many of the developers who work there have limited knowledge about how PHP actually works and tend to have a better understanding of Laravel than what's actually going on.

They have trouble when it comes to resolving issues when Laravel does not having something to offer.

I think that it is important to know the base language when using a framework for something. That way you can understanding the processing and find solutions easily when the framework you're using doesn't have a solution built in.

How many of you guys are in the same boat? I've personally been writing raw PHP for at least 8 years.