This is the log for my server startup. As it shows, after LP loads data, nothing else happens, but the file watcher still works. Version 4.2.87 works normally, but 4.2.89 does not.

I need to see a thread dump when the server hangs.

Run the jps command to view a list of running Java instances, and then use jstack to perform a thread dump.

https://dzone.com/articles/how-to-take-thread-dumps-7-options

I just tested 4.2.89 again on my server, and the hang no longer happens. It may have been related to specific mod/plugin configurations or mods/plugins installed at the time.

Ok, feel free to re-open if it happens again.