When an armor stand is placed suspended in air with no support beneath it's placement position, the armor stand will be put 1 block lower than expected (at it's head level).

Steps to Reproduce:

1. Place a block suspended in air
2. Place an armor stand on the side of the block
   → observe result
3. Place a block diagonally downwards from the first block
4. Repeat step 2
   → observe result

Observed Behavior:

When the armor stand is placed with no support, it is spawned at the head level relative to the block. When it is placed next to the block when there is support beneath it, the armor stand is placed as expected at it's foot level.

Expected Behavior:

In both cases, the armor stand would be placed at foot level, regardless of supporting blocks.

Screenshots/Videos:

For extra context with the steps to reproduce, your result should look something like this:

Notes:

Related closely to MC-269179