Extremely concerning warning in my project

I just saw a very concerning warning in my project settings, unfortunately I have already put a lot of work in it.
It says that I am using experimental features that will prevent me from publishing. The project passes validation and loads into Fortnite for play testing. Does that mean it will also pass for publishing? If not, how can I locate the features that are still beta?
Is there a list of features from Unreal Engine that should not be used in UEFN?

Here are screenshots from the project settings and material editor.


You can’t publish with experimental content,


try turning them off

Thanks @Mineblo. Since I see that yellow warning in the material editor it must be some node. For my custom made materials I only used what comes right out of the box in UEFN, nothing brought in from the Epics library. The only thing I could think of are the world aligned texture and world aligned normal nodes, but there was no warning coming up when I used them.
Is there a way to find experimental features?
Unchecking the experimental content box in the project settings does not seem to get rid of that warning.

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That warning always stays there, you can try to publish an island and see if it reaches the point where it lets you type island name etc

Yeah, that’s what I just did. Waiting for review now. Thanks again @Mineblo !

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Hi all,

Just to add a little clarity here - those two messages are not related.

Substrate has gotten some of its ‘tendrils’ into the UEFN branch. (Since UE5 and UEFN are being developed at the same time) - You’ll see that the ‘Project Settings’ it mentions does not even exist in UEFN. (Edit->Project Settings in UE5) You can safely close that panel.

Typing the warning out in text so it shows up for any future humans searching for more info on that warning: “Details cannot be shown: Substrate (Beta) is not enabled for this project (See the project settings window, rendering settings section)”

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Thanks @Astrotronic for the clarification!