Ghost-lit Graveyard Hideout - Shadow rendering error - disappearing shadows

Hello dear wonderful GGG! <3

There is a huge problem with shadow rendering in Ghost-lit Graveyard Hideout. I bought a lot of trees (25 pieces) for real dollars and suddenly it turned out that there is a huge problem with the disappearing and appearing shadow. I would like to buy even more of these trees because they are great, hideout is great too but this shadow problem makes them impossible to exist if there is such a big graphic problem with it. What I should do now? Not only trees I would like to buy and now I can only put super flat things there so that their shadow is not visible and pretend that there is no problem with their shadow? Don't use these trees at all and forget I bought them and pretend there's no shadow problem? I want to enjoy the new hideout and beautiful trees. Please fix this problem as soon as possible.

Youtube video with Bug:
https://www.youtube.com/watch?v=Ar0kP55Dqys

Quick gif:


Your best fan, Chris. :)
<3