Why does the Codevision "too many initializers" error occur?

Question

C++ / C#

Hello.
The code throws an error "too many initializers"
"too many initializers"

#define buffer_MAX 16
char buffer[buffer_MAX] = "0123456789ABCDEF";

And so for some reason it works, probably the compiler settings affect, but all the same, all this is strange

#define buffer_MAX 16
char buffer[16] = "0123456789ABCDEF";

Answer 1

"It doesn't work like that, but it works like that" is, most likely, some kind of fiction and / or reticence. There is no difference between these two options.
Otherwise:
1. This initialization is correct in C and incorrect in C++.
2. The standard C compiler in CodeVision contains a known bug, due to which it refuses to accept this completely correct code. Although the error message is worded differently.