The NBT data that's on an armor stand (as item) won't be applied to the armor stand when it's being placed down. This was not the case in 1.19.2.
- Give yourself an armor stand with some custom "EntityTag" NBT data, for example, an armor stand with "Small" set to "1b" by using the command provided below.
- Place down the armor stand.
- Take note of how the armor stand doesn't have its "Small" NBT tag set to "1b" upon being placed.
"EntityTag" NBT data of armor stands is ignored upon placement.
"EntityTag" NBT data of armor stands would not be ignored upon placement, just like in 1.19.2.