Torrent can not start download when first piece is missing v2

[temp]

I have reported a bug before but I'm so sad that you didn't get my meaning. (P.S. I'm not English-speaker, and I've try my best to explain...)
Reference:

So, I decided to do an experiment to prove my finding (with detail steps and pictures below). And I'll show that it was really a bug.

 

Step 1: Find a movie file, such as a mp4 file.

Step 2: Create a new torrent for that mp4 file.

http://postimg.org/image/njfub3bj5/

Step 3: Torrent created. (torrent remain stop at this time)

http://postimg.org/image/m9i0w1hr5/

 

Step 4: Use a Hex edit tool, such as HxD Hex Editor to open the mp4 file.

http://postimg.org/image/v4ngkavxd/

 

Step 5: Change the first 2 bytes. E.g. change from "00" to "FF". Then save.

http://postimg.org/image/rsp5r0469/

 

Step 6: Force Re-Check the torrent

http://postimg.org/image/d2zq8rcip/

 

Step 7: The first piece of the file will be damaged, and the torrent will become 99.8% (or maybe 99.9% depends on the file size)

http://postimg.org/image/rddvxzi8x/

 

Step 8: Start the torrent for seeding.

http://postimg.org/image/kqr84t0kh/

 

Step 9: Use another computer to open the torrent that you created. And try to start the download.

http://postimg.org/image/qt3g91ee9/

 

Step 10: Both computer can see each other but the download is not starting.

Computer A: http://postimg.org/image/4m9epbmld/

Computer B: http://postimg.org/image/6vxj02vj5/

 

[rafi]

Interesting test... What is your advanced->bt.prio_first_last_piece setting?

If you have a 100% fully downloaded torrent, does it work in your setup?

[aanyadsouza]

Finally.. found the solution..!! Thank you for sharing this..!!

[rafi]

Solution to what?