This is intended. Iron golems do not spawn based on nearby on monsters, but based on different criteria, see the wiki article.
Edit: The wiki article appears to be incomplete. Villagers also try to spawn golems when they panic, however there are similar requirements for spawning a golem and there is no guarantee that a golem will always be spawned.
Is there anywhere this is stated in the 1.15 pre-releases as of 1.14.4 villagers would spawn golems based off fear of a nearby monster and I cant seem to find a change in any pre-release for 1.15
This is intended. Iron golems do not spawn based on nearby on monsters, but based on different criteria, see the wiki article.
Edit: The wiki article appears to be incomplete. Villagers also try to spawn golems when they panic, however there are similar requirements for spawning a golem and there is no guarantee that a golem will always be spawned.