As you can see in the video, when the slept Pigepic wakes up from Horror it doesn't get any additional damage from Pocus' Dreaded Alarm despite getting the alerted status.
I think what is happening is as soon as Horror's damage calculation happens the turn ends, so it bypasses the Pigepic's new alerted status and only checks the new status changes that happen at the end of turn.
#[1.3] New Dreaded Alarm trait not working properly when more than one temtem gets the alerted status
minor moss
agile root
The damage is done at the same time the tech damage is applied
minor moss
Ah thanks! Didn't seem clear visually but that clarifies it!