Watch showing "Core sleep" while awake on guided meditation

Hi everyone, I recently started tracking my sleep again with my Apple Watch and was surprised to see that it identifies my meditation as "core/light sleep"...

I know I'm awake because it's a 50min technique that involves visualization and practice, but I always keep my body still and in a deep state of relaxation... Has anyone else experienced the same thing? I've been tracking it for the past 5 days and it's always the same, showing core sleep even though I'm mentally fully awake, i believe it is because i dont move