Custom block geometry broken in 1.17.30.23 beta

It is not possible to make custom block geometries using addons in the 1.17.30.23 beta. All blocks appear as a normal 16x16 pixel cube, when they should have the geometry defined with the minecraft:geometry component.

Here is what the blocks look like in 1.17.30.22:

Here is what they look like in 1.17.30.23: