Zombified Piglin's look like old zombie pigmen

Can those of you having this issue after removing add-on packs from your world check that you have pack updates enabled under Settings > General > Profile > "Auto Update Unlocked Packs"? I would not expect this setting to impact the default global resources, but it might. Please comment back if turning that and reloading Minecraft with internet connected resolves your issue.

@GoldenHelmet, Please see screenshots above for my settings, labeled BubbaDoodah. I am only using the Minecraft Texture Pack which is the default.

I opened my SP world and went to the Nether, and I too saw zombie pigmen where I expected to see zombified piglins, The spawn egg was named zombified piglin, but spawned a zombie pigman.

Just by coincidence, I forgot that I had activated the White Chunk Border v5 by Sigma Theta resource pack on that world. When I removed the pack and restarted Minecraft, I had zombified piglins as expected. The pack definitely does not have the zombie pigman texture (or any texture, for that matter) within it, so it must be that somehow the pack being active causes the vanilla resource pack to fall back to showing the older textures, which is something it should only do to support old Marketplace packs that haven't been updated to 1.16.

Examining the resource pack itself, I noticed that it uses an up-to-date manifest file format but omits the [min-engine-version] value from the manifest.json file, which is nonstandard. So I added "[min-engine-version]": [1, 14, 0] to the header, restarted Minecraft, and tried it out again and now I have zombified piglins, as I should.

The [min-engine-version] value was added to manifests in 1.14.0. It identifies the oldest version of the game the pack supports. If omitted, it defaults to the oldest version of the game that supports add-ons, which is somewhere back around 1.2 I think. That could definitely be what is making the game revert to zombie pigmen, although I'm not convinced it should do that for a resource pack as opposed to a complete world template.

If this theory does explain the problem though, the White Chunk Border pack probably isn't the only one that triggers it. When [min_engine_version] was added, which was part of a manifest file format upgrade, I noticed that the add-ons I had source code for tended to upgrade to the new format but allowed [min_engine_version] to default, since it didn't seem to make any difference. Consequently, I imagine most resource packs are capable of causing this problem.

@unknown: Your screenshots show that you don't have any resource packs installed via the UI, but I suspect you may have one leftover anyway. When you activate a pack, it gets copied to the world folder, but if you subsequently deactivate the pack it isn't deleted, it's only removed from a list. The UI shows you what's in the list. Maybe the game is seeing the pack code (it could be in either the "resource_packs" or the "development_resource_packs" folder under your world folder) and responding by enabling support for old versions, but the UI isn't showing it because it's not in the list. If so, that sounds like a bug in the code checking for resource pack [min_engine_version] values. If you're the experimenter type, you might want to check for these installed pack folders inside the world folder and if you find them, delete the folder. (Don't worry, the game will recreate these folders if it needs them.) One other thing: You may never have deliberately used any packs, but if you join a multiplayer world while your settings are set to auto-update packs, you might not notice the messages about it downloading and installing packs from the server.

@Auldrick, I had a Beta Remover pack which I totally forgot about, because I thought I had removed it a million years ago. I followed your suggestion, and I removed it from my World. Surprise, surprise; I have zombified piglins, see screenshots. Thanks for looking into this issue. I would have never guessed the resolution.  How do I correct "Beta Remover This pack is missing" error in Global resources for the current world, see above screenshot. I have tried deleting the pack from the World Settings Resouce-pack and Game Settings Global, but I get the aforementioned message. The pack has been physically removed from resource_packs folder, but valid_known_packs.json file still has a "Beta Remover" entry. Should the entry be removed from valid_known_packs.json?

I only am having this issue on my realm all of my world have the right one 

I can confirm that a chunk border highlighting pack triggered old zombie pigmen textures on my iPhone.

Putting on texture packs can sometimes trigger old textures because not all texture packs are updated.

Seems to be working as intended then? Rather than fixing a million resource packs that omitted the [min-engine-version] value from the manifest.json file, might be easier to obtain a resource pack that adds the zombie piglins instead. 😄

I am also having this issue on my realm. I am using the Custom Floating Text Addon and it hasn't been updated since 1.16 was released. I guess that has something to do with this issue... But I think if the addon/texture pack didn't use to change the Pigmen texture it shouldn't change back to the pigmen idk

This can also occur with java edition textures too 

Thank you for your report!
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It's still occur in 1.17.10. I have texture packs on but the texture pack doesn't change anything realted to zombified piglins, but it still occurs.

still occurs

Affects 1.17.40.20

Steps to reproduce:
1. Apply a resource pack that has the "min_engine_version" setting below 1.8.0 or unspecified to the top of the list
2. Load a world with no other resource packs applied on top
3. Find or spawn a zombie pigman/piglin

Expected: New zombified piglin texture applies

Observed: Old zombie pigman texture applies

Reason discovered: The new entity Json file does not load if the min version on manifest.json is lower than the one in zombie_pigman.entity.json

Workaround: apply a pack with manifest min engine version 1.8.0 or higher. This pack might help