Not functional as of SteamOS 3.5.19

Trying to open Notebook on SteamOS 3.5.19 (Stable) results in a type error. Unfortunately it's cut off on the screen, so I can only read part of it:

    TypeError: Cannot read pro
      at eval (eval at impor
      at eval (eval at impor
      at PluginLoader.import
      at async PluginLoader.