villagers still keep disappearing when crossing a portal

several game mechanics are not the same as Java ... How to be able to fly Elitro from a flat surface, or even change the color of the letters on the plates using only the dye.

villagers are constantly disappearing, especially small children .... When they pass through a nether portal, they don't go to the nether, they just disappear

the gold ore is not being smelted in the furnace

Minério de ouro não derrete na fornalha