It just doesn’t make any sense.
Nope. Neither does the dagger.
I kind of sort of like this explanation of the dagger found here:(https://www.reddit.com/r/starwarsspeculation/comments/efnzvh/why_would_the_sith_make_a_knife_that_does_what_it/)
"The only explanation that makes sense to me is that the dagger was given to Ochi by a member of the Eternal Sith Cult. His orders were to kill Rey’s parents, retrieve Rey, then use the dagger to find the wayfinder for himself to bring Rey to Exogol. I guess having the coordinates eched into the dagger was a dramatic way for the overly ritualistic cultists to get their message across? “Here’s a mysterious dagger delivered to a Sith assassin by Sithy persons unknown; you know what to do, bro.” Maybe this is standard operating procedure for these evil weirdos.
After initially failing in his mission, Ochi kept the dagger with the intention of finding Rey through other means. He had the dagger on his person when he unexpectedly died."
I also like the idea (which I read somewhere else but now can’t remember where) that the wayfinders were keyed to Vader and Palpatine bloodlines in some way and that is why Kylo was able to retrieve his as it was stashed by Vader and that was also why Rey was needed to find the one Palpatine stashed as his was ‘keyed’ to his DNA, so Ochi had to have both Rey and the Dagger before he could retrieve the Wayfinder and find his way back to Exogol (if I remember correctly the room Rey finds the Wayfinder in just kind of opened as she approached it so this would make sense, i guess…).
So Palpatine returns, knows he’s got an heir out there that he wants to turn so he has Sith cultists recruit someone and give him a means to return to him on Exogol but only if he completes his mission, but safeguards it so that if someone else finds the map they wont know what it is out of context. The fact that it matches up with the Death Star II remnants just means that the Sith Cultists/Palpatine didn’t make the dagger until they knew they were going to recruit someone to abduct Rey and bring her to Palpatine on Exogol.
–It works for my own head cannon, i’m sure it will be shot full of holes soon enough though. And it doesn’t really do much for all the other issues in the movie.