Since I updated from 1.4.2 to 1.4.5 I noticed that spiders no longer get falldamage when they hit any kind of water before the ground. Even the water 7 blocks away from a water source.
And this was clearly not the case in 1.4.2.
And since this wasn't in any update notes I assume its a bug.
Here's a video showing the issue:
http://www.youtube.com/watch?v=5xSWkuHC3Ow
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In fairness to OP, MC-1644 has no labels, and the title isn't really related to this issue
Duplicate of: MC-1644 - Please use the search function to see if your bug has already been submitted.
Currently 30% of tickets are being closed as duplicate.