Human subject face morphing beyond 7-8 secs

prompt :
boy starts immediately walking, (camera walks back along with with boy and camera always at a distance of 8 meters from the boy:1.5), subtle grin, looking at the camera,

outcome :
face is changing 100% beyond 7-8 secs mark for human subjects.

i guess its expected.
posting just in case to check if im wrong.
also this prompt format probably does not work "(xxx:1.5)"

input image 1968x2528
if prompt has no "walking" its not that much severe
teacache on (will try off next)

No source file, test, or entry point is named. Reproduce the reported prompt with the supplied input image, focusing on face changes after 7–8 seconds, then compare TeaCache enabled and disabled as suggested. Done means establishing whether the behavior is a defect and documenting or addressing the result with a reproducible check.

Written by the indexing model from the issue text.