ionic bloom
The two vertical rooms in sunken city that you can see on luca's location in the screenshot have a connector that you cannot jump back out of if you go down. No matter how you wall jump luca will always fall back down into the bottom room instead of climbing out.
a screenshot in the bottom room
top room, it's at the grate
ok apparantly if you spam whipshot you can get out, but with regular jumps it's really finnicky