I tried installing a pluging on a working node.js tiddlywiki (running 5.1.13).
First I wasn't sure if you had to both add the plugins through the ControlPanel and in the
tiddlywiki.info file.
As it got me errors upon accessing the tiddlywiki, I guessed the ControlPanel part was wrong.
I restored my tiddlywiki (I had it backed up before trying anything, as I usually break everything I try to touch).
The tiddlywiki loads & works fine.
If I shut down the server, edit the
tiddlywiki.info file to add the plugins to the plugins subsection, then save the file & launch the server again, no plugin is loaded.
Accessing the ControlPanel shows only the base plugins (tiddlyweb, filesystem, highlight and core [which is not listed in
tiddlywiki.info]).