插眼 is the comment you leave before the story is finished. Someone is testing a stain remover, waiting for a refund, or promising an update tomorrow; you mark the thread now so you can find the answer later.
Its gaming image is useful but not required knowledge: place a little “eye,” keep the spot in view. Compared with 码住, the boundary is a tendency rather than a wall—插眼 simply feels especially natural when something is still unfolding.
