Preinstalled Node-RED modules get uninstalled

Anyone here experienced this issue or just me? I would try to reproduce it on a different IOT2050 if that was really my own problem, will append --loglevel verbose to npm install command.

EDIT:

I found it's a "normal" behavior because even "npm install" without any arguments would remove preinstalled module. I think this is related to npm dependency hell which I don't fully understand. At least reinstall uninstalled preinstalled modules worked for me.