Similar to MC-271252, bucket entities reset their attributes when picked up and replaced with a bucket.
How to reproduce
Spawn a tadpole
/attribute @n[type=minecraft:tadpole] minecraft:scale base set 16
Pick up the tadpole with a water bucket
Place the tadpole back down
Expected result
The tadpole would retain the minecraft:scale attribute at 16.
Observed result
The tadpole's minecraft:scale attribute was reset to 1.
Can confirm.