I was standing in my base when the restart happened at 6:00 am. When I reconnected hours later, I have dies due to...nothing.
I had to respawn in a bag.
I was wondering why that happened and if it's related to this plugin.
I stood in a completely closed room of my base when I died.

Nope, is'nt related. The plugin uses the inbuilt "Quit" function, which is equal to the "quit" console-command