The hitboxes of seagrass and tall seagrass don't adjust to match the random visual offset of the model.
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This is most likely intentional due to MC-3073

That's the same thing as tallgrass.
Works as intended. Its intentional because blockstate offset change the X-Z between the gaps with their hitbox are on center.
Can confirm in 20w51a.
Can confirm in 21w06a.
Can confirm in 1.16.5 and 21w08b.
Can confirm in 1.19.
Can confirm in 1.19.2.

Can confirm in 1.19.3

Can confirm in 23w03a.

Can confirm in 1.19.4