Aäron
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The water flowing west in this case is not a bug: "If there is a hole six blocks or fewer from the point of origin, the water will tend to flow in that direction." - Minecraft wiki.
Recreated it, creeper seems to float, though the floating animation is very subtle. If you make the ceiling one block higher, it'll jump up and fall down the stream.
Probably not a bug. Experience bottles should be a bit rare/special, so I think they changed this intentionally.
I recreated the situation in the new snapshot, I based my findings on that. It really is floating, but the animation of it jumping up and down is not showing correctly. If you look closely you'll see it's bouncing a tiny bit. Other thing to do is to swim to it yourself, as long as you keep pressing space, you'll notice your view doesn't bounce as it used to.