The 30 days timer isn't tied specifically to any server, but rather a notifier that by 30 days, you'll have cross server. This can open early, which is what you're experiencing.

Except we didnt get the perks that cross-server arena brings with itself, like zenith and seasons. We also do not have cross-server sage world battlefields. Only arena. And its 60 day timer, starting halfway through doesnt seem reasonable.

For a new server; practice arena goes x-server at the end of the first month. And at the end of 2nd month; a server gets its' season feature activated; ranked arena goes x-server, and maximum rank reached gets reset; and prizes are distributed in accordance. After that your rank will be reset at the end of each month. It has always been like this, and will always be such. If it is your practice arena that went x-server, there is nothing out of order. However, if it is ranked arena then there is something wrong.

Yes, it was for ranked arena as well. That is why I made this post as it had affected the 7 day competition event, where battle tickets could be used only in ranked arena matches. And it went back to normal after the event ended. Probably something in the event bugged the arena.

nvm, we still have cross-server ranked even after that event half of the time.

Zenith requires 30 days of server age (the typical time for cross server arena). Season system requires a server age of 60 days.

Cross server sage requires being in a merged server, not simply having cross server unlocked. Arena is also cross region to be specific.Just because one mode is open doesn't automatically unlock others (they may have different unlock requirements).

Your ranked season will end the following month on a new server rather than the first month to account for non-1st of the month opening. If your training arena opened to cross server, the ranked would as well.