Because the breaking animation for full blocks is also used for blocks existig out of only the half of a block, this looks a bit strange when looking at it from the side of a slab. You see the breaking animation spreading from the top(bottom slab) or from the bottom(top slab) when you look to the side of it
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Can confirm
[media]
Can confirm in 21w03a.
Can confirm in 21w06a.
Can confirm for 1.16.5
Please include screenshots pointing out the issue