This does not make any sense, as only one of the eggs is actually being broken.
Either only the egg being broken should display the cracking animation, or breaking a stack of turtle eggs breaks all up to four.
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In 20w11a

In 20w12a

I don’t think this is WAI as this is not the case on bedrock.

Confirmed/Reproduced in 20w29a.
Can confirm in 20w51a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 1.17.
Can confirm in 1.17.1.
I'm pretty sure this is WAI because that's one block with the block state
eggs
with a number from 1-4.