align_items_to_bottom no longer aligns items to bottom

A shelf with the align_items_to_bottom: true tag does not align items to the bottom as expected

Steps to reproduce:

• Place a bottom aligned shelf using the following commands:

• /setblock ~ ~ ~ oak_shelf

• /data merge block ~ ~ ~ {align_items_to_bottom:true}

• Place something in the shelf

• Notice how items remain centered

Additionally, some items like banners are moved upwards when align_items_to_bottom is true (see attached screenshots)