Severe Lag Occurring Only in Cross-Play Ranked Matches

I’m a Japanese player playing in Asia.

I play on PS5 and have been playing this game for three years. Since my friend plays on PC, we often play together using cross-play. Until November 2025, I was able to play ranked matches in cross-play without any issues, but starting in December, only the ranked matches in cross-play suddenly became very laggy.

All other game modes still work normally, just like before. Therefore, the issue is not caused by my home internet connection.

Please look into this issue. Thank you.