Swarm Lighting Build Fail

Hey everyone - I keep getting swarm lighting build fail for no apparent reason. I’m using Epic Games marketplace project on UE4-26. It seems like the engine from day to day is corrupting static meshes. I have a corrupted one, I fix it, and something else randomly breaks and I have to start over to figure out what it is. There is no rhyme or reason to it.
Also, it corrupted my landscape to where if you add foliage, splines, or sculpt the landscape, it fails the light mass build.
Since all that, I have completely removed the engine and reinstalled it, and it is still corrupting assets. Can anyone help me? Thanks in advance!

Hello and thank you for posting.

If you have any error logs, output logs etc., feel free to provide them. Swarm can fail for numerous reasons.
I see you stated you are using a Marketplace project. Are you stating that you are using a sample from the Marketplace? If so, please provide the sample’s title for reproduction purposes.

I look forward to your reply.