Tilesets no longer keep its collisions, with either CollisionPolygon2D or CollisionShape2D and character goes right through them
Created by: rubenjavier
Operating system or device - Godot version: Windows 10 64bit Godot 3.0 commit 90592ccf03521cda14ee3a9576b671136da2021d
Issue description: New Tilesets or old Tilesets with collisions defined and re-exported, loose their collisions and KinematicBody2D (character) goes right through, also their collisions are not being drawn
Steps to reproduce: Get a Tileset scene from a couple of days ago that have working collisions or create a new one with a Sprite+StaticBody2D+CollisionPolygon2D, save the scene, export the scene as a Tileset The collisions dont work anymore and the character can go right through the Tiles