Magma cubes spawn from nether portals

In hard mode small magma cubes should spawn from nether portals just like how Zombified Piglins do, increasing the hostility of the nether by making the portal fight back by spreading nether mobs. This would be a great subtle difficulty increase. and if it gets annoying and players want to avoid it they just need to break the portal when not in use, and then relight it. magma cubes spawning also increases the availability of magma cream to make fire charge easier to obtain but with a challenge. and magma cream can be used to make fire resistance potions as soon as you go in.