Vancouver island messed up after last update

Brief description of the issue:
There are now “volcanoes with lakes in them” which collapse when getting close, only to reappear when flying past.
Provide Screenshot(s)/video(s) of the issue encountered:

Detail steps to reproduce the issue encountered:
Fly south from CYCD (follow the highway).

As mentioned see this thread After Today update, i get Spikes on Terrain and and Mesh Problems not only at EDDL