Yes, you understand correctly. Thank you!

I was able to get a hold of someone and the support ticket issue is now fixed.

@Dr-Sassi The support page does not appear to be working. I go to "Submit a request" to create a ticket. I put in all the necessary information. I then click "Submit." However, when I click "Submit", nothing happens other than the Submit button getting greyed out and the cursor turning into a red circle with line through it so I can't click it again. And no requests end up in my request list.

I purchased four Transformer models off CGTrader. The native format was .MAX, but the author has also provided alembic files (there are also FBX's but they do not work correctly).

Three of the alembic files import into C4D just fine. However, one (Optimus Prime) does not. The model has missing pieces in the viewport, despite the pieces being there in the object hierarchy.

Here is an example. On the head, one antennae is there but the other is missing. But both are present in the object hierarchy. In truck mode, the hood and windows (along with other pieces) are missing.

The alembic file imports just fine into 3DS Max. It also imports just fine into Blender. But C4D seems to have problems with this particular one, and I can't figure out why. If necessary, I can provide the file privately for diagnosis of the issue.