One file per actor causes massive delay when deleting level files

Summary

When you migrate a level that was built in UEFN to another UEFN project, then delete it, it takes a massive amount of time to do. Just for a 6k actor level, the process takes around 25 mins.

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Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

Create a level and place prefabs until you have 10k actors.
Save and migrate it to a new UEFN project
Go to the other UEFN project and without opening the migrated level, delete it

Expected Result

The process is almost instant like every other case of deletion

Observed Result

Process takes really long time and UI also shows that deletion goes above 100%

Platform(s)

PC