While passenger position was fixed in MC-259576 for default-sized Phantoms, Minecraft does not take mobs' size into account. The larger the mob, the lower the passenger.
/summon minecraft:phantom ~ ~ ~ {Size:80}
/summon minecraft:slime ~ ~ ~ {Size:40}
Tested on Slimes and Phantoms.
The slime screenshot is for Size 40 Slimes.
The phantom screenshots are for Size 25 and Size 80 Phantoms.
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