The "(on amnesia)" in the window title no longer appears when using the Tor Browser Sandbox

The "(on amnesia)" in the window title no longer appears when using the Tor Browser Sandbox, when it used to be there.

I'm not sure if this is normal (if it was designed to no longer appear after a period) or if it's actually a bug

Setup: Ubuntu 17.04

Trac:
Username: leakedwiki