1. put an iron golem and a group of pillagers in 2 different chunks
2. make the group of pillagers chase the iron golem and follow them until the 2nd chunk is unloaded (leave a small group of pillagers that started shooting at him at the unloaded chunk.
3. the pillagers in the unloaded chunk will begin shooting at the position of the iron golem even after he died, rapidly, after the chunk was reloaded.
I checked it twice
sometimes not working, try again
this video is unlisted
MC-137506 Pillager constantly firing into the ground with nothing to agro onto to