As of 1.14, iron golems use to target raiders during raids, as in 1.16.200, iron golems can't detect raiders far away anymore, it causes the raiders to kill the villagers if iron golems aren't detecting them far away 

Separated ticket MCPE-121894

Expected Results: Iron golems should detect them far away

Observed Results: Iron golems doesn't detect them

Reproduce Steps: 

1. Spawn a lot of iron golems and villagers
2. Trigger a raid
3. Find the raiders where they spawned