Hey there. Nobody in our team owns a mac, so it's hard for us to test out builds for it. From what we can tell, it could be either a memory mapping or security issue, but we're unsure of how to fix it on our side. The demo runs just fine on Android and Windows though.
The issue is likely an engine-side bug, hopefully it will be fixed in a later version of Godot. What we can do is raise an issue about it on the godot github and see where that goes.