Oooh, that’s really specific place
and at least those new ones used fixed suffixes

that part’s tottally understandable
small positive is at least read as its written(I’d say)

I’m guessing it also has vocative, which russian lost on the way

Croatian has 7 cases (padeža), it lost ablative and allative while russian additionally lost vocative.
Which seems like insignificant difference.

from personal experience,
we just deleted our accounts once school/uni was over
and started new chapter