Hello everyone!
We have a strange graphic bug in UE 4.25-26. 4.25 Oculus Branch too.
After random time from game start all static meshes with static mobility and lightmaps and dissapeared, or… more like distorted with vertex animation or something like this. In ue 4.24 we don`t have this problem 
Scene have only static lights and baked lighting.
Can someone say - how to fix it?
https://youtu.be/zr80rFDjCqg - short vid with result
https://youtu.be/42lj6dbW2Kk - a little longer vid. Captured mesh dissapear