Bug description

Cannot deserialize byte[] in class like:

    [MessagePackObject]
    class Ms {
        [Key(0)] public byte[] rgb;
    }

Then,

var input = new byte[] { 145, 147, 127, 127, 127 };
var byte_array = MessagePackSerializer.Deserialize<Ms>(input);

Expected behavior

deserialize success

Actual behavior

Unexpected msgpack code 147 (fixarray) encountered.

• Version used: 3.1.4
• Runtime: Unity

Additional context

If use List<byte> instead of byte[], it will run correctly.

Maybe related to #1165