You're right - Bookman Antiqua is an OpenType font. I've just tried, however, adding a genuine TT font and that doesn't show up either.
It's almost as if adding that first font has "cached" something which is preventing it from seeing new fonts.
I see that in the "system" folder on the Gen3 there's a file called ".fonts.cache-1". Dare I try to delete that file and see if it helps, I wonder?
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