Blayer98 I have attempted to reproduce this and couldn't even get as far as you did. I placed it on the same spot on the Bluewater terrain and tried both residential and community lots. The lot mostly crashes on the loading screen, it has the same visual glitches, but I cannot even draw a room without it crashing. Flattening the lot does the same.
At first, I thought it was an issue with steep terrain, but it does not crash on non-beach lots no matter how funky the terrain is. Terrains with flatter beaches, such as Twikki Island, seem mostly alright aside from the waves' texture appearing on the front of the lot.