Zombie pigman will spawn sometimes when the portal created

If you mean nether portals than it was always like that, it allows for creation of various redstone contraptions like portal on/off switch.

Of course this works on Java, and worked like this for years. See, for example, this 3 year old tutorial: https://m.youtube.com/watch?v=c8ciKQ-J6Xo.

Ok, after changes to defect title and description this is now duplicate of MCPE-98020

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We're tracking this issue in MCPE-98020, so this ticket is being resolved and linked as a duplicate.

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