MKVToolNix is Unable to Open a Specific MKV File

Hello, I need to update a previously multiplexed MKV file, but for some weird reason, MKVToolNix v74.0.0 isn't able to load its contents. Basically, after dropping such MKV file, or loading it thru' the program's contextual menu, nothing will happen. At first, I thought of this might be the cause:

#3270 (closed)

But I cleaned both folders (cache & jobQueue), and the problem persists. Then, I tried with a "fresh" portable version of the program (last version, x64), and I got the same result.

This seems to be an issue related to this particular MKV file, since all others I tried so far keep loading just fine. The file itself doesn't seem to be corrupted, and it works just fine.

I left an active upload process to your FTP server, in case you might be able to take a look at it. It should be ready in a couple hours.

Edit: Already uploaded as "#3487 (closed) - This File Won't Open".

Thanks.