I just upgraded to 0.103.0. The following shows up in my log:
2019-12-12 12:45:07 ERROR (MainThread) [homeassistant.components.alarm_control_panel] Setup of platform alexa_media is taking longer than 60 seconds. Startup will proceed without waiting any longer.
As such the alexa_guard entity is not getting created.
I don’t know if related but I also noted the following comment in the blog for version 0.103.0: