Both flowers and grass (as well as regional grass analogues such as roots) can be off-centered from their base block for a more natural effect. However, this does not affect the hitboxes of grass, which is inconsistent due to it affecting flowers.
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I can confirm.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 21w08b.
Can confirm in 21w11a.
Can confirm in 1.17.
Can confirm in 1.17.1.
Can confirm in 1.18.1.
Can confirm in 1.19 and 22w24a.
Can confirm in 1.19.2.