Level no longer opens but similiar level can open in UE

Development Programming & Scripting
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Hello everyone. I’m a solo dev and I’m having trouble finding a solution to my issue. One of the levels in my project no longer opens in UE 5.7.1. I keep getting this error after it tries to load.

Error: appError called: Assertion failed: HeightmapsNeedingEdgeSnapshotCapture.IsEmpty() [File:D:\build++UE5\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeGroup.cpp] [Line: 903]

There were no recent changes to the level (has World Partition) and that’s why I’m perplexed at why it all of a sudden won’t open.

I’ve done all the possible fixes from the Internet I was able to find. I even switched to Nvidia studio driver for the GPU and the level still won’t open. Any assistance is welcome, since I’ve spent many hours on this level and I would like to recover it.

I’ve deleted folders from project directory and UE 5.7 user directory (intermidiate/derivedcahc and saved foiders). Switched to DX11 and changed GPU driver. Has anyone come across this issue?

EDIT I tried a differnt step to load up the level by creating a duplicate of the level. I don’t know why but this allowed me to recover the level.

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Hello there @Mena_Novastorm!

Considering the error you were getting, there was a conflict between your WP setup, and the heightmap snapshot. When you duplicated the level, you forced the engine to regenerate the landscape metadata, which was most likely stale or corrupted. I hope that helps making sense of the fix!