[Scene Graph] Project corruption if crash occurs during compile verse

Summary

While working on a project, I updated some verse code on a prefab that was nested in several other prefabs. While compiling the changes, UEFN crashed and now when I attempt to open the project I get an error that states “Serial size mismatch: Got 22, Expected 14”

Project cannot be opened unless I purposely put an error in the verse code before opening the project. But this causes all the custom verse components to disappear from all prefabs and there is still a chance the next time the projects opens it will crash.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Verse

Steps to Reproduce

Nest a large number of prefabs in prefabs (I had around 120)
Have the prefab editor open to the prefabs
Hit compile code
Crash editor
Attempt to reopen uefn project

Expected Result

Project Opens

Observed Result

Project Crashes on open with a “serial size mismatch” error

Platform(s)

PC

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Screenshot 2025-12-04 053707.png

FORT-1028040 has been added to our ‘To Do’ list. Someone’s been assigned this task.