"execute as @e[type=minecraft:armor_stand,tag=bug_tester] store result entity @s Pos[1] double 1 run scoreboard players get @s bug.y" doesn

If you "execute store" the score of an entity into its Position property, it takes 30 to 60 seconds until the Position is updated. And that bug isn't just visually. Also if I request the Position per command it gives me the non-updated value.