Previews not updating without Rails restart

[Jackson200]

Hi all,
Basically like the title, previews don't update without restarting Rails, if anyone has any insight?

My preview files live in spec/components/previews/, but I had the same issue when they were under test. When I update the component.rb, or component.html.erb I see the changes on refresh, but when I update my spec/components/previews/component_preview.rb I need to restart Rails to see the changes.

I have searched for spring or cache that shouldn't be on development, but I am stumped.
Has anyone come across this before, or have any ideas?

Thanks a million for reading.

[joelhawksley]

Added a test case to show that this works: #2341