Ladders no longer stay in place without a block behind it. So if you remove the block the ladder vanishes. Hasn't effected those already in place so best not to touch them.
Certain fences aren't connecting to each other, not sure which ones don't connect to which. This will break stuff
1.13 update isn't coming anytime soon, unless something unforseen changes.
Red is working on possibly creating a custom debug wand, though.
Less of a bug more of an unintended consequence.
When you place a chest it automatically protects the area around the chest you placed and prevents people from building in that area. This is good for survival but not so much for people who are collabing on a house or castle and now one is locked out of building.