Saving a map breaks mine doors and entrances

[bdew]

Problem is in this code:

https://github.com/codeclubab/WurmModServerApi/blob/master/src/main/java/com/wurmonline/wurmapi/api/MapData.java#L777-L789

Should probably add a check that the tile in question isn't a mine door or hole.

[keenan-v1]

It does look like this is indeed the issue. As far as I can see, that code is trying to determine places where rock would be exposed, and if it's not rock, make it rock.

I think it would also be prudent to grab the cave data and check for a cave entrance. This way if anything were to happen where a tile was inadvertently set to "hole" or "mine door" without said cave behind it, it will automatically be fixed on save.