OS: MacOS
Compiler: DMD 2.084

Test code:

import std.stdint;
import std.bitmanip;

void main()
{
    // int64_t     auth_key_id=0;
    // ubyte[8] u1 = nativeToBigEndian(auth_key_id);
    enum s = int64_t.sizeof;
    ubyte[s] b;
    int64_t message_id = bigEndianToNative!int64_t(b); // bug
    // ubyte[int64_t.sizeof] b2; // bug
}