Failed to load Asset (but its still on the map)

Hello, since yesterday iam using the 4.20.3. I converted my project from 4.19.2 to 4.20.3.

So i created in the 4.19.2 with the BSP Brushes some 3D Models (Buildings). They worked fine in 4.19 and now in 4.20.3 it tells me “Failed to load asset”. I cant open the 3d model, i cant place it BUT on my main map, where i placed the object in the 4.19, i can still see it on the map!?

Can someone tell me what happened there?

→ There is no information in the log about this specific loading error

Hello,

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Thanks