missing system tray icon running Keybase on Ubuntu 18.4 in i3wm

Hi, I've been running Keybase on Ubuntu 18.4 for more than a year, and on this particular notebook for weeks, without issue. Today, I needed to use Keybase, and realized that the system tray icon is no longer loading. I now know that I can invoke Keybase via a `run_keybase` command, so I can still get to the application just fine. But... it seems weird that the system tray icon is no longer displaying, even after I run `run_keybase -a`. Help?

my log id: 22b3f935b083db5c49f3661c

Start by reproducing the missing system tray icon on Ubuntu 18.04 with i3wm, including after running `run_keybase -a`, and inspect the provided log ID 22b3f935b083db5c49f3661c. Done means the Keybase tray icon loads reliably in this environment and the issue no longer occurs.

Written by the indexing model from the issue text.