/attribute @s minecraft:(attribute) get is inaccurate

when using a custom item for example

/give @p netherite_chestplate[attribute_modifiers=[{id:"armor",type:"armor",amount:100,operation:"add_value",slot:"chest",display:{type:"default"}},{id:"armor_toughness",type:"armor_toughness",amount:100,operation:"add_value",slot:"chest",display:{type:"default"}}]] 1

and the following cmds give these results

"/attribute @s minecraft:armor get" caps out at 30.0

"/attribute @s minecraft:armor_toughness get" caps out at 20.0

ideally they should show 100 for both

why is this weird? 🧐

when trying the same thing with these cmds the results change:

“/attribute @s minecraft:armor modifier value get minecraft:armor“ gives the correct result 100

“/attribute @s minecraft:armor_toughness modifier value get minecraft:armor_toughness“ gives the correct result 100

if this is intentional i would like to hear why 😁