TL;DR: There was a loophole found in an older thought experiment that indicated that at the quantum level, nothing is real until it is observed.

A discovery was recently made that found a way to add an unknown variable into the mix such that an expiriment where the future seems to affect the past was possibly explained away by a classical model.

However, a new experiment was proposed to show whether the new classical model actually was the explanation — and it turns out this classical “loophole” can not explain it.

So we’re now back to the beginning where it once again appears that nothing is real until observed at a quantum level which is also referred to as “anti-realism”.