I've had similar bugs IRL. It's good to be aware of such issues, nice kata.

Rejected...

Should address this issue in the description instead of simply replacing the Ruby / Crystal / Java specific function with Python's.

Also, the new author solution is arguably inferior because it can now incorrectly match characters that are not between the ASCII digits 0 to 9. Consider that:

print("①".isdigit())    # True
print("⑵".isdigit())   # True
print(("³").isdigit())  # True

Done

The idea of the kata was to illustrate using a dictionary to improve efficiency of search. Without that, I'm not sure it's very interesting.

I have no control over the rating. It was set by the reviewers in the beta phase. My understanding is that it cannot be changed now.

100k data sets for a 7kyu kata is overkill. That's why raiting falling pretty bad.
I suggest limiting the amount to 1k and do not bother with efficiency (because that would put the kata in 6kyu category).

As a reminder:
https://docs.codewars.com/curation/references/kata-ranks#7-kyu

The kata description could be more Python-oriented for sure, but the instructions themselves are fairly clear and straightforward. Additionally, there's already another issue addressing this, making a second issue seems redundant.

IMHO current constraints makes it 6kyu.
At 7kyu brute-force solutions should be accepted.

much more torough tests have been added to C#. tons of solutions did not make it ;-)

added in Java

I like the idea of this Kata, but you can get away with just half of the solution because tests don't cover all of the edge cases.

I can't believe nlogn solutions get so many best practice votes... 🫠

Fixed.

C# starter code contains:

#TODO: write your solution here

Which causes an error:

src/Solution.cs(6,14): error CS1024: Preprocessor directive expected

"#" in C-Sharp marks the beginning of a preprocessor directive.
"//" should be used instead for one line commenting.

Yeah, you're right. It's placed in a such way, you need to read every word in the description a few times in order parce the requirement.

status_group: This column categorizes the applications into two groups: 'Rejected' and 'Approved'. We display 'Rejected' at first.

But it is mentioned.