I killed some villagers a while back on Xbox One v1.12.1 in survival normal mode. My village probably has about 7-8 villages combined into one big one. Over 100 villagers easy. I killed them probably at least 50+ minecraft days ago. A good week in reality. I am still plagued with iron golem attacks. Only a couple are angry at a time though. I labeled some that were friendly but later I saw they were agressive. I haven't harmed any villagers since killing them a while back. I have traded a ton with them since. Even upgrading several to master level. Buying the last item many times. I went so far as to remove every door in the village to reset the entire village. This was 120+ doors. Still I get angry irom golems spawning in the weirdest locations and come straight for me. They even spawn in my base. I've created my own iron golems as well to no avail. I have left the area, gone into the nether, and stayed away but eventually an angry golem will naturally spawn somewhere and seek me out.