Steps to reproduce:

1. Open attached project "808515.zip"
2. Open scene "repro"
3. Run it
4. In console notice comparison of NetworkWriter and BinaryWriter results after Write.

Actual result: NetworkWriter always takes values from the beginning of the source array -> offset is used when putting values to targetArray.
Expected result: Offset is used when selecting value from sourceArray.

The problem which occurs due to this behavior is that there's no way to write middle of the sourceArray to targetArray (since values are always taken from the start) unless you make additional copy of sourceArray.

Reproduced with: 5.2.4f1, 5.3.5p7, 5.4.0b24, 5.5.0a2