When you create a 4x4 infinite water and take a bucket of these 4x4 block of water, visual bug appears with non-existent block of water. All you see is a 3x4 blocks of water instead 4x4.
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Please attach a screenshot.

Sure.
[media]Perhaps this is MC-12363?

Nein m8. In MC-12363 the bug happens when you pick up with the bucket and the bucket looks empty.
But the bug i found, is when you pick up water (i dont proved with lava), from a infinite water system, the 'block' of water dissapears and only appears when you exit from the world and enter again. Don't matter if you do this quickly or slow. And only in the system of infinite water, don't happen when you pick up water on the sea.
19w38b/i5-4460/rx 480/W7x64
This is already covered by MC-12363. Explanation: This does not only happen when "rapidly turning" as said in the report title, but also in other cases. Particularily on servers, it might just happen seemingly randomly. The ticket is a general ticket about the client-server desync that occasionally happens with buckets.