In vanilla neovim you can use autoread... this does depend on a focus event like entering and leaving the pane or switching buffers. However, for my workflow which is "go to a different terminal pane and do some things then switch back" as soon as I focus the buffer it updates.

Where as with Zed it'll just keep showing the old content and in fact closing and opening file wont even change what it shows in Zed. It's really really annoying. I have to exit zed and open it again. This means if you are working with AI agents you end up having to do this often.