Crimson Longinus
Legend
But it doesn't have such language, which is the issue! Either invisible creatures can "somehow be seen" by normal vision, in which case invisibility spell does almost nothing, or they cannot, in which case you cannot find hiding creatures just by seeing them by normal vision, as you cannot see them! Like those are literally the two possible interpretation under the RAW, and both are nonsensical. It is simple as that.The key issue seems to be that 'unless they can somehow see you' covers a lot of ground. The invisibility spell really just needs some text to say you cannot be seen by normal vision or darkvsion.
All the people who argue that RAW works, try to smuggle in some invented rules that allow them to rule these situations differently, but no such rules exist in the text. Just accept that your perfectly sensible approach is a houserule and move on.