It is fundamentally unsolvable problem.
Many literature about it from fiction like https://en.m.wikipedia.org/wiki/In_a_Grove
Through pop sci https://www.goodreads.com/book/show/789727.How_Real_Is_Real_
All the way to the deepest epistemological problems.
The main reason is similar to why AGI cannot be achieved — it is impossible to achieve something that you can’t or haven’t clearly defined first.