Someone else has had a similar issue here:

https://youtu.be/4z5OOW1jL94

I’m also using an M1 Mac.

I’m also reverse engineering the vendor .net binaries to attempt to figure out what is going wrong.

Though I’m struggling a little with the obfuscation. 😂

it’s not something as simple as endian issues!