you might need to buy the new, upgraded crafting item.
You have to buy the new mortar for sure but it still shouldn't get stuck in 89%. It always allows to do the full level you're doing.
Have you been making successful potions? If you fail the potions a lot, it takes forever to level. If re-launching, new mortar and successful potions don't work, you should contact support. Sometimes the professions gets stuck until you re-launch the game (= exit the game and launch the game again, just re-logging without actually exiting the game may not help).
Hopefully it gets fixed