Reproduction steps:
1. Open an attached project on 5.6.0f3
2. Press play
3. Observe the console output, first log is bytes written to stream, second log is bytes loaded from file to stream. They are identical.
4. Open the same project on 5.6.1f1
5. Press play
6. The bytes written/loaded are not the same anymore

Not reproduced on: 5.6.0f3
Reproduced on: 5.6.0p1, 5.6.1p2, 2017.1.0b8, 2017.2.0a3
Regression introduced on: 5.6.0p1

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Users should use Close instead of Flush on the GZipStream. The reason why using Flush worked before, was due to a bug in Mono.