u/notdeadbutcold

I've recently started reading RI and am loving it so far. I'm currently in chapter 469. I was confused about a small thing. When Fang Yuan travelled from the central continent to the northern continent (meeting Ge Yao) using fixed immortal travel gu, his cultivation was suppressed by a realm and we were told this happens when travelling between regions.

But when Fang Yuan travelled from the southern continent (three king's inheritance) to central, it didn't happen. Did I miss something or is there an explanation for it?