Twinmotion Library in Unreal Engine is no longer working?

Hello everyone!

I’ve always used the two plugins for the Twinmotion Library for UE (Datasmith Twinmotion Content for Unreal Engine - Twinmotion Content for Unreal Engine Plugin (Beta 4)). I had them applied to an old project of mine in UE 5.1, but when I opened it today, all the meshes I placed and all the materials I used for the collection were gone. Is this a momentary problem or a permanent change in the system? Thank you in advance.