Every time I see this, my first thought is, “Why is my X1C spitting out white filament?” Then I realize it’s just the reflection of the interior light.
Is it really or purging the white filament you used for your previous print. Also, why is it purging at that location???
Yes, I always fall for that too 
As I mentioned in my OP, it’s just the reflection of the interior light.
Yep, that happens to me as well