Drop of glass can be viewed through the portal

Drop of glass can be viewed through the portal.
And if you look in this way through the portal some blocks are not visible such as: 

Ladder; Cactus; Qak Sapling; Flowers; Ice; Glass; Sugan Canes; Scaffolding; Toch; Redstone Torch; Sreing; Banner; Beacon; Lanten; Sea Pickle; Piston: Stinky Piston; Armour Stand; Bambboo; Shilker Box; Vines; Lily Pad; Hopper; Anvile; Brewing Stand; Painting; Door; Trapdoor; Item in Item Frame; Water.

Sorry if you made a mistake