We are glad to have you here with us. I understand the small bridge on the right side disappear when you move your camera angle, with some rocks in the background.
I recommend you to check the troubleshootings listed on the AGS support page regarding Frame Rate and Performance Issues, focus on GPU drivers and change between game window’s size.
If you’re still having problems, we need you to contact AGS customer support (Contact Us | Amazon Games) to escalate your case and review it more deeply.
Please make sure to add the DxDiag and Gamelogs through a sharing link from a Cloud Storage like Google Drive to the support report; instructions for generating a DXdiag: