Overview:
When trying to expand an allocated NBT array, it will give the wrong response.
To Reproduce:
/data modify storage nbtbug array set value []/data modify storage nbtbug array[0] set value "value"
Returns "{color:#ff0000}Nothing changed. The specified properties already have these values{color}"/data get storage nbtbug array[0]
Returns "{color:#ff0000}Found no elements matching array[0]{color}"
Expected either:
The error states something like "{color:#ff0000}Nothing changed. Arrays cannot be expanded{color}"
Or it succeeds and data get storage nbtbug array[0] successfully returns "value"
Comments 2
you can't set a value that doesn't exist
This is only true for list/array entries though,and even that's not always the case:
/data modify storage test list set value []
/data modify storage test list[{doesnt_exist:1b}].some_value set value 1breturns
{list:[{doesnt_exist:1b,some_value:1b}]}(or at least, it used to, haven't checked in a while).
I suggest reopening and letting mojang take a look.
You have to use append to expand an array, you can't set a value that doesn't exist. The error message being misleading would be a different issue, see MC-255915 and MC-176679 for example