What I expected to happen :
See the wheat uproot itself.
What happened :
It didn't.
How to reproduce :
Make a black room, till the dirt, plant a seed and update it (place a block aside, power it with redstone; change the light level (<9), etc).
Note about affected versions :
I guess the behavior of seeds changed in the first 1.7 snapshots.
Impact on the game :
Wheat don't need anymore light to stay planted.
Farm based on turning off light don't work anymore.
Sorry if I made mistakes, I'm not English ๐
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Added some screenshots.
Affects 1.7.4 release too.

Duplicate of Unresolved
MC-19886
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The bug I reported is not the same one. MC-19886 is ยซ Plants don't cause an update when the block beneath is broken/light level changed ยป.
Mine is about plants not being updated by placing blocks around them and changing light level.

Your issue has already been reported. However, all these are duplicates of MC-19886.
Since MC-19886 has been fixed today and this bug is still occuring, I think you've wrongly considered this one as a duplicate.

Relinked the issue to MC-30877, which describes the observed behavior and is currently open.
Please attach a screenshot of the bug.