NoGravity tag doesn't work on entities that NoAI doesn't cover

When attempting to use a NoAI tag on non-living entities.
It will not work.

The new tag NoGravity for ArmorStand obviously sounds like it should cover those entities.
But it doesn't. This is a bug as its expected behavior and has no valid reason for not being covered.

An example is FallingSand. A lot of mapmakers can use this to create fake walls which look solid, but players can walk through.