Minimax H3 9:16 vertical video always has very clear tile line

9:16 0.4M

16:9 tile line is not that clear. can we have more control on the vae decode method to decrease or remove the very clear tile line

Reproduce the reported Minimax H3 outputs at 9:16 and 16:9, then trace the VAE decode entry point; the issue names no file or test. Compare tile-line visibility while evaluating possible decode controls, and consider the work done when the 9:16 seam is reduced or removed without degrading the video output.

Written by the indexing model from the issue text.