Oh yes, I didn't think of going deeper that one level of proxy references, that could explain it. Thanks again!

I was assuming entering a proxy which was itself using a proxy wouldn't be permitted, but didn't try it. It's quite confusing if this is permitted, as that code would then have to check for circular references or assume a limited number of levels too wouldn't it, which makes the calculation quite obscure.

I might need to try and find the relevant C++ code at some point if I've time.