Call of the ooze and "in sight"

[Number43]

Call of the ooze says in its description that it forms oozes next to enemies that are "in sight", but it sometimes triggers on enemies that are not actually in sight, being one tile beyond vision around the corner or outside of my vision range. However I then picked up a +14 light radius lantern, and if enemies are beyond 11 tiles it won't trigger on them even though I can see them.