Ok I hope this works.  Ran minecraft without optifine.  As you can see below in the following screenshots, chests don't connect when placed on the ground.  Fences appear as single posts in the ground.  Same thing with iron fences.  Glass panes also appear as single posts.  Doors are not shown open/closed properly, almost like they're broken.  This is pretty much the way it is whether a texture pack is being used or not.  It's been an annoying issue since 1.13's release.