Blank screen after screen lock

Hi!

Using elementary OS Hera, latest version of the Keybase app. After my screen automatically locks itself and returns control to LightDM and I unlock my screen, Keybase shows a blank screen until I quit and restart the app.
It does appear the app still runs because I can see my mouse pointer change as I move my mouse over the window but the screen is a solid black window (in dark mode).

I would upload a screenshot, but all you'd see a black rectangle.

I can replicate this consistently by manually locking my screen and unlocking it. It doesn't matter if I'm using the dark or light theme.

Client: 5.6.1-20210125164223+f3b21527b9
Service: 5.6.1-20210125164223+f3b21527b9

No source files or tests are named. First reproduce the issue by locking and unlocking the elementary OS screen, then inspect the Keybase desktop app behavior around LightDM handoff using the reported client and service versions; done means the window renders normally after unlock without restarting.

Written by the indexing model from the issue text.