While searching for similar bugs I came across MC-2912. It is very similar, accept the blocks don't swap completely here.
In creative mode I put two different blocks (Stone and dirt) in my hotbar (slots one and two). Then I swapped them by hovering over the dirt (2nd slot) and pressing "1". The graphic updates as expected. I then try placing dirt (now in 1st slot), stone is placed. Placing stone works as expected. Also works with potions (and probably any other food-like stuff, if you could eat in creative mode), except you drink them instead of placing them.
Steps to reproduce:
1. Go in creative mode.
2. Put two different blocks in any hotbar slots.
3. Swap them by hovering over one and pressing 1-9.
4. Try placing the blocks. The one you were hovering over looks like it is being placed but then tunrs into the other block, the other block can be placed as expected.
5. Open inventory while holding block you had hovered over. Your hand will be animated as if you were swapping blocks. The problem is fixed by that.
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The difference from MC-2912 is , as I said, that the blocks do not swap completely. In MC2912 if you do what I described above the block is simply replaced and you have the same thing twice. Here you only have the same block twice until you open your inventory again. I guess that could just be added to MC-2912 but I doubt I am able to do that and even if so, I have no idea how to do so.
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Sounds like the other report is just not detailed enough. I can give it to the reporter of this ticket since the original reporter is inactive.
edit: God damn my eyes. Here, I gave you the ticket, take good care of it 🙂
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I made some changes, I hope you approve 😃
I'm sorry, how is this different from MC-2912?