Hi @OctupleElm15084,
What you see here is realted to the spikes & mesh issue that has been addressed by the devs. Spikes on Terrain and and Mesh Problems - Global
Coastline/Shorelines have also been addressed and they have started working on it according to the feedback snapshot:
[BLOG] January 7th, 2021 Development Update - Community / News and Announcements - Microsoft Flight Simulator Forums