The bug
When I flew to my nether portal in creative mode, there suddenly appeared very much zombie pigmen, and game started to lag very much. When I killed all them with /kill @e, the game said that nearly 3,000 entities (including me) were killed.
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is duplicated by 1
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I have the same problem with a survival word. I think the portal keeps the world loaded and somehow this pigmen can spwan even when nobody is online and then pile up because they dont despwan without a player.
It could be either because the portal is in a spawn chunk or because enteties constantly hop in and out of the portal whic if done long enough more pigmen will spawn and will result them going trought the portal in and out also which could create a loop keeping the chunks alive.
I am unable to reproduce this issue in 1.17.1 Release Candidate 2. I tried several times to re-create this by using different methods and each time, was unsuccessful.
Please check what the randomTickSpeed gamerule of this world is set to.