Some key events don't work in "Share without Code" mode

**Shared Program**:

Compare the modes:

(without code) https://code.world/run.html?mode=codeworld&dhash=D-JUPwMn0IDgEM6yUFSLzhQ
(with code) https://code.world/#P6tEDmltimRsFxyib2GzDSA

**Description**

On Chrome Version 72.0.3626.121.

If you play the version with code, everything works as expected. If you play without code, your first arrow press will get stuck to always being pressed.