/Fill command doesn't work with The original portal [Nether Portal] Not The end Portal

• Details:
  Try open Minecraft then try create a new world and then try Enter commands then try writing /fill then [coordinates] then write in the end [Portal] Don't write in the end [End_Portal] Something like write /Fill ~_-3~~-1~Portal you will find that /fill command places air instead of the portal [Nether Portal] not end Portal
• How to reproduce:
  When enter commands and writing /fill command then [coordinates] then writing portal [Nether Portal] Not end portal in the end , /fill command should places portal not air.

Plz fix that fast as you can because This was really important for the player.
Sorry because I don't attach a screenshot because this issue doesn't need a screenshot. And I mean in this issue the nether portal not the end portal.