Billboard meshes no longer working?

Billboard meshes should always face the camera on the Y-axis, which is useful for stuff like 2D trees. It used to be possible to mark a mesh as a billboard by prefixing the mesh name with either BB_ or BBZ_, but it doesn't seem to work anymore.



The cube on the left is prefixed BB_, while the one on the right is BBZ_. The old Shape Editor confirms that they are recognized as billboards.

Here are the same two meshes in the Alpha Pre-Race update from 2014 (yes I somehow still have this on my computer):



As you can see, they're working properly here, with BBZ_ on the left and BB_ on the right.

 

Thanks for replying!

There was indeed something wrong with the .DAE, but not with the naming of the objects. I found out that it's 3Ds Max 2021's built-in .DAE exporter that causes the problem for some reason. By simply importing the non-working files then re-exporting with the OpenCOLLADA exporter (https://github.com/RemiArnaud/OpenCOLLADA/) or Blender, the billboard meshes work properly.


From left to right:

1. Blender cube with BB_
2. Max cube with BBZ_ exported with OpenCOLLADA
3. Max cube with BB_ exported with OpenCOLLADA
4. Exact same scene as (3) but exported with Autodesk COLLADA

I've attached (3) and (4) below.