I don't know if this is just a creative issue, as I haven't tested it in my survival world, but whenever I empty a bucket, it empties where I am looking rather than next to whichever block I selected. This is making it very difficult to place lava and water because there is often a block in the way that clips the path. Only water and lava buckets are doing this, all other blocks are fine.
**Clarification** I am not in split control, I have toggled it on and off to make sure and I still can't place water easily.
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Thank you for your report. This issue was, however, submitted earlier as MCPE-17417. Please perform a search next time to make sure your bug hasn't already been reported. The parent issue can easily be found by searching for "mcpe unresolved bucket".