Can't speak for anyone else... but I'm using Passive Investigation for traps and secret doors.
That is how I'm going to do it too.
I was going to start a post about this regarding Dungeon Delver actually. But I'll drop this in here...
"You have advantage on Wisdom(Perception) and Intelligence(Investigation) checks made to detect the presence of secret doors." Pg. 166
Based on the following factors:
-Investigation skill stating "you might deduce the location of a hidden object" (see hidden object again below)
-Wording of Dungeon Delver citing that Investigation can detect secret doors
-Wording of Observant citing that Investigation can be used passively
-The rogue being prompted to make Int second highest "if you want to excel at Investigation"
-And lastly the wording in the sidebar next to the investigation skill wherein it says "When your character searches for a hidden object such as a secret door or a trap, the DM
typically asks you to make a Wisdom(Perception) check." (the underline is mine) NOTE: "typically" does not mean always.
Based on all of that, I think I've concluded that the intention was for Investigation being able to be used instead of Perception for Int-based classes when it comes to hidden objects (e.g. secret doors and traps). That gives players two different approaches to a problem in a fashion similar to how Str and Dex can be two different approaches to hitting/damage with various weapons. You don't always have to have high Wisdom and Perception just like you don't always need high Str to hit with a melee weapon.
Perception would oppose stealth, Investigation wouldn't. But Investigation would help with research, whereas Perception wouldn't.
But for secret doors and traps, if Investigation can't be used by rogues instead of perception, then it makes investigation 90% useless and rogues should have been told to put their second stat as wisdom for perception- which of course screws their caster archtype.
Anyway, like I said, that is how I'm running it. If they come out with actual errata that says you never use Investigation for hidden objects then they have to clean it out of four places. If instead they say, "Yeah, of course the player can use whichever skill favors them more." Then they really don't have to clean up anything- or at most add "or Investigation (player choice)" to the "typically" line so that people don't read "typically" as "always".