I can not graduate the season.

Bug Name:

I can not graduate the season.​

Bug Description:

I completed season pass quests and [winter season]Protect Fughar quests 20/20.
I have used watch and transfer exp from Corsair to Sorceress.
During this phase, I haven't finished [winter season]Protect Fughar quests, and those quests are transferred to Sorceress.
After the 19th quest of Fughar, I found out that I could not accept the 20th quest.
Then, I found that I still had a quest book in the inventory of the previous character: Corsair.
Thus, I finished fughar's quest with both characters and the problem came out.
I used weapon transfer ticket to Tranan and he didn't allow me to change the weapon.
Somehow, I could not recieve the graduation quest from Leyla.
So, I forfeit that quest to remove the problem, but it didn't solve my problem.
I deleted Sorceress and raised another season character to resolve this problem.
But, I still stood infront of Leyla without graduation.
Please help me out!​

How to reproduce/proof:

Sorceress was the character I created at the very first stage of this server, and havn't played it for many years.
When I finished 20th quest of Fughar, I recieved boss weapon change ticket which didn't work on the sorceress.​

 

Graduation period of current season will start only in 2 month.