UMG Widgets with Verse Events made in 40.10 can cause constant crashing and cook errors in 40.2. Crash also happens when attempting to load

Summary

Attempting to open UMG widgets which use Verse Events (with no parameters) will crash the engine completely and prevent cook errors.

All UMG widget blueprints have “[Compiler] Internal error: An event is invalid.”

Have attempt to verfy files and this has now happened multiple times with UMG widgets that was originally made pre 40.2.

Hours of work completely borked at the moment. Happens to every UMG widget that an event variable made prior 40.2 is bound to a OnClicked event.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

UI/Tools

Steps to Reproduce

Open UMG widget made in 40.10. Crashes editor

Expected Result

Events work as expected, the ability to open up a UMG widget in editor.

Observed Result

Unable to validate and editor crashes 100% repo rate. Looks like a memory access crash

LoginId:9a3b3db34799942d62506eb90db2224e
EpicAccountId:3a4cf0801ec348aa9b4483f0a78d8c78

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000168

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kernel32
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Platform(s)

PC

Video

FORT-1089898 has been created and its status is ‘Unconfirmed’. This is now in a queue to be reproduced and confirmed.