Some information to back up the point:

The main use of regular invisibility is traditionally a non-combat application - for sneaking and scouting, and other similar things; that's why it lasts an hour and breaks on most major actions.

The main use of greater invisibility is for in-combat scenarios where the advantage it really provides - alongside setting them up as an unseen attacker, granting advantage on their own attacks against targets that cannot see them, and giving attackers disadvantage if they cannot see the invisible creature in another way - is that the invisibility knocks out a few other important things that are specifically combat related:

- The invisible creature generally will not provoke opportunity attacks, because the opportunity attacks specifically must be used against a target you can see.
- The same is true of many targeted spells; "a target you can see within range" is the most common wording.

So yes, unless the target has also made a stealth roll, Or the DM decides the circumstance is such that being invisible alone is enough (it is a hovering creature that makes no other sounds, for example) we should absolutely have a rough idea (as in, to the square, in combat terms) where the creature is, even though we cannot perceive it with our eyes. A practical DM, in a real-world situation, will allow this too be somewhat fuzzy - they'll tell you that you know roughly where it is, and give you a narrow general area that might encompass two or three squares, if they're not directly next to you, for example - but that's active DMing; for a game, we should simply keep track - and should eb able to target applicable abilities on the creature if they don't formally have an actual sight requirement.

For example: You CAN target an invisible creature with Scorching ray, at disadvantage - it does NOT specifically require you too be able to see the creatures you are targeting. However, you can NOT target the invisible creature with Magic Missile - as by its wording that spell requires you to be able to see the creature.

As much as I'd like to hope for it.... I have very little faith that Larian possesses the nuance to get this right, however. We can hope.

Currently, the amusing part of this is that you can still 'find' the invisible attacker by using the game's own UI against it - just wave your mouse around and watch the movement line - it will path around the invisible creature, so you can pin-point the spot where it is standing, by where the line will not go. If you then follow that up with something like create water on the spot, it breaks the target's invisibility when it gives them the 'wet' status. The game is pretty ridiculous right now.