They wouldn't have written anything yet, and certainly wouldn't be filming yet.
Edit, oh I see, I think you mean the show is honoring him on the set,
with the memorial tribute of the photo and flowers.
___________________________
^ From the instagram stories of actress Annika Noelle of B&B,
posted the morning of Sept. 19.
https://www.instagram.com/stories/annikanoelle/3195357647553695402
B&B and Y&R are filmed in the same studio building.
I think Annika saw this when she came in to work ? ? ?
I think it's just the show honoring him on the set.
This it what it says:
@youngandrestlesscbs
#BillyMiller
If youโre thinking about suicide, are worried
about a friend or loved one, or would like
emotional support, the Lifeline network is
available 24/7 across the United States.
Dial 988