In a bastion, I was swarmed by invisible piglins and piglin brutes, I noticed the bug earlier but didn't think much of it, and then died when many piglins and piglin brutes swarmed me, while invisible. It didn't effect all of piglins and piglin brutes I saw in the Bastion, but a large amount of them were invisible.
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Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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Duplicate of MC-193509. This bug is caused by optifine. Therefore that ticket is invalid. This optifine bug should already be fixed as far as I know. Make sure to update the modification.