After waiting the "forgiveness timer" zombie pigmen/piglins remain hostile.

The forgiveness timer, according to the Minecraft wiki, is when a player is outside of the detection range of 33-55 blocks for 25-55 seconds AND/OR has no direct line of sight. After removing line of sight with solid blocks for roughly 30 minutes, the zombie pigmen/piglins remained hostile.

In some cases, even after death zombie pigmen/piglins remain hostile (with forgiveDeadPlayers true). It is triggered inconsistently, so I do not know how to replicate "anger after death"