data modify modifies player item data but shows error message

How to reproduce:

1) Put item in hand

2) Run command:

data modify entity @s SelectedItem.tag.display.Lore prepend value "{\"text\":\"test\"}"

After running the command, the lore of the held item is changed, but the still game writes the error message: "Unable to modify player data" in chat. But this only occurs if the item already has a lore.