"not used in any level" is a Dangerous Filters

In the content drawer we have the possibility to filter our files by “not used in any level”
Which is a very useful filter to have.
The only problem is that this filter includes some required files for the project to work.
The “GameFeatureData” file is listed with this filter.

This can be very dangerous because recently I wanted to clean my project of all the meshes that I no longer use and I accidentally deleted this file.

It now prevents me from opening the project at all.
image

To fix this, all game data files should be considered “used” in the level and therefore not listed under the “not used in any level” filter.

@Vysena_CrossMcPenna Thank you for your report! We would like to look into this further, would you be able to submit a bug report using the form available here: Fortnite Creative