When you jump on wheat crops usually the farmland become dirt, then seeds and wheat be dropped. However if you jump on potatoes and carrots crops farmland become dirt, but crops stay there.
There's a video where you can show it:
http://www.youtube.com/watch?v=rNuBbioQ5LI
Linked issues
is duplicated by 11
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But they drop for me.
En el video acaso no vez que esta en Creativo. Osea por que pones en Game Mode Surviviente O.o
This is still not working proper in MC version 1.4.5. Is there any advice for a temp fix?

Reopened.
Unable to reproduce.
I'm unable to reproduce the bug in Minecraft 1.5.1, I think that bug did not appear again.
Same result as Tails in 1.5.1.
Kumasasa you must give us steps of how to reproduce, because we are unable to reproduce this bug on 1.5.1

Me ? I've reopened this ticket, because the issue was reported in MC-12933 with 1.5.1
Oh, and maybe it was a mod that he was using that keeps that bug. I should test that bug with mobs setting the gamerule mobGriefing on true, as they don't revert farmlands to dirt on gamerule mobGriefing on false...
I'm not able to reproduce that bug on an unmodded 1.5.1

Ok, re-closed.
If anyone still having this issue, please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report and zip and attach the world to this ticket.
I only get that bug on the modded Minecraft, but I tested that bug on a superflat world with an unmodded Minecraft 1.5.1 (on a village farm I found), and I did not get that bug.
Fixed in the future!