Avatar Eyes Closed in Last Frame – How to Keep Eyes Open?

Hi HeyGen team,
I'm generating videos using your Avatar Video Generation API. I've noticed that sometimes the avatar's eyes appear closed in the final frame of the video, which makes the ending feel a bit unnatural.

Is there any way to ensure the avatar's eyes remain open in the last frame? A setting, parameter, or best practice recommendation would be very helpful.

Thanks in advance!