[Bug] Exercise 2 is unavailable until the page is reloaded in "Слоги Королёвой Гласные А-И-У"

[HappyEgoiste]

Precondition:

1. Log in as default user ([email protected] / password)

Steps to reproduce:

1. Go to https://brainup.site/groups/1/series/18/subgroup/142/
2. Click on exercise 1 (https://brainup.site/groups/1/series/18/subgroup/142/exercise/1978)
3. Complete Exercise 1 and press "Продолжить" button

Actual result: Exercise 2 is not available to continue until the user refreshes the page.

Expected result: Exercise 2 is open for practicing without need to refresh the page.