I may still have it wrong. I'm on a conference call and distracted.

Have you guessed why it worked?

It's because I was running with render GC, so all my material-based GC or AGC calls were disabled, so it didn't matter if I got them wrong.

Now that I'm testing with render GC off, it's not working right.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)