Hello F-D,
From what you describe and your screenshot this looks to be a bounding issue.
What can happen is if you have geometry that exceeds your rendering bounds scale then that geometry will not render.
If you click on the object creating the hole and go to your Details > Rendering > Bounds scale by default it should be set to 1.0. If you set this to 2.0, and then increase this if this isn’t enough, does this fix it?
If not I can try and test this on my end with that object.
For me to do that I will need your .uproject file, your content and config folders, from your project files.
Let me know if this troubleshoot helps or you would be willing to share a copy of your project.
Thanks,