When I use the following command:
"/execute as @p at @s anchored eyes run summon armor_stand ^ ^ ^1 {Small:1b}"
the armor stand will only be small as soon as it hits the ground, it will be big midair. But if I do the same without "anchored eyes" or even with "anchored feet" the command will work as it is supposed to, meaning that the armor stand will be small midair and on the ground (I only know this example, I don't know if this affects other nbt data as well).
MC-126411
The subcommand of /execute "anchored eyes" affects nbt data of entities
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Ha, this was a spooky one!
Tried it myself and almost fell for it, but it's merely a trick of perspective. Try adding
NoGravity:1bto the NBT and you'll quickly realize that it was small the whole time.