Currently I am having a weird bug with the current release of forge (6.0.1_349) with 1.4.2. 
  
The problem I am having is that when I install it, with no extra mods or plugins, I can't get seeds from anything that is not fully grown. 
  
I have tried a brand new jar file (not modded) and made a  map, I could break a ungrown piece of wheat and get the seed back (of course). 
  
I then took the same jar file, deleted the meta-inf file and added Forge (didn't delete forge's meta-inf) and started the same game again, no mods or plug ins and the bug is reproduced. 
  
I have no idea what might be causing it, I didn't see anything about it through a search or possible fixes for it. 
  
Thanks again in advance, I might just not be installing it correctly for all I know.