Sounds like the helpers installation was botched, I haven't used the Python plugin inside IntelliJ since I have access to PyCharm as well - but I know PyCharm i

Sounds like the helpers installation was botched, I haven't used the Python plugin inside IntelliJ since I have access to PyCharm as well - but I know PyCharm installs a ton of helpers inside the remote ~/.pycharm_helpers directory or something similar, might want to clear them out and after you reconnect to the remote interpreter it should reinstall them.