Piglins don't run away from soul fire torches/lanterns/campfires

Unable to reproduce, are you using any data packs?

When you place the items down, are the piglins currently attacking you?

Initially, I noticed this in a world with datapacks, but to fully confirm it, I moved to a brand new vanilla 1.16.1 world. I noticed the same occurrence.

To respond to gretmagic27, I tested it in a scenario where they were attacking me and where they weren't and It doesn't seems to effect the issue.

Please provide a screenshot of the setup you are testing it in, and make sure the F3 debug screen is enabled when taking the footage.

Upon further inspection, they're running away from the soul-fire objects now (i don't know why), but they aren't running away from the warped fungus.

Warped Fungus only works for Hoglin as a repellent.