I had a house on the shore of a Mistlands biome that I generated early in the year. This update completely regenerated the terrain, despite the devs insisting that this would not happen.

A mountain generated inside my house, so naturally I tried digging it out, but now I've hit bedrock and half my house is still inaccessible.

Here's what it looks like:
https://imgur.com/a/Q64aLLP

Any suggestions?