I didn't see the middle check ...

I could not find any solution actually doing this because of built-in copy or const ref semantics but added a test for it anyways:
https://www.codewars.com/kumite/67346c955b6178ce3d28a71e?sel=67346c955b6178ce3d28a71e

Given a 2D array of some suspended blocks (represented as hastags)

I'm assuming the description is supoosed to read hashtags, not hastags.

your issue report is unclear. this behavior is normal and is the same across most languages on Codewars: the fixed and random tests are each in their own tests group / it block and are run separately.

duplicate suggestion

Why use the term whitespace when only space is used?

Applies to the C-version.

I could have tagged with issue, question or suggestion for that matter.

kak dela drug

That's on me. First I approved the transaltion with a bug, then I spotted the bug, then I fixed it in full tests, and forgot about sample tests.

Now the sample tests should be fixed too (remember to reset the trainer to see new sample tests).

Reason for the bug: C sample test's tester function should replace tolerance 1e10 with 1e-10

C tests seems to be broken. No matter what I return it's a success. It's working for "attempt"

It's part of the kata to make that optional 3rd parameter working. While I might agree that it is hard to parse this task from the description this error message is not a kata issue but intended.