You can get PORTAL blocks in a vanilla survival world with no cheats

You can get portal blocks by glitching nether portals using grindstones and with some grindstone glitch that by putting a grindstone over a like ladder or vine it becomes a (ghost block) but the item still drops and u can pick it up by ( because of a visual glitch ) the grind stone is still floating and by lightning up the nether portal and using a piston to push you in front of the grindstone you can (if you get lucky ) mine a PORTAL block using haste 2 and a efficiency 5 and silk touch diamond picaxe and players can get one by one portals :0 please fix this issue