Shulker's scale attribute cannot be over 3.0.
How to reproduce
Summon a Shulker with scale attribute 3.
/summon minecraft:shulker ~ ~ ~ {Attributes:[{Name:"minecraft:generic.scale",Base:3}]}
Try to set it to 4.
/attribute @e[type=minecraft:shulker,limit=1,sort=nearest] minecraft:generic.scale base set 4
❌ The Shulker stays the same size.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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