this was always my take on this discussion as well.

i think this whole phenomena is more or less a communication misunderstanding and a matter of semantics. I believe that the people who report not being able to "see the apple" are people more inherently capable of more introspection and other metacognitive tasks. they identify correctly that the "mind's eye" is basically the brain imagining what sensations of vision a particular thing might elicit, the same way we might imagine the sensations of touching something fuzzy or imagine the sensations of tasting something bitter. I think very few minds can "project" visual imagination of an apple before the imaginer as thoroughly indistinguishabley as if you got real sensory input of an apple.

i think that people who claim to really see the apple are taking the imaginary sensation of vision as equivalent to the sensation of vision generated from real sensory input, and therefore presuming that it counts as actually seeing it. and those who claim not to see the apple are likely just noticing the difference and assuming they're lacking because the imaginary sensations and actual the sensory stimulus are clearly different things.

we have a word for when people actually see things they cannot ordinarily distinguish from reality, even if they're aware of them as such: hallucinations.