Paste Remembers Layers
Updated Illustrator to version 26.0 a day or two ago.
Continued working in a document created before this. The option "Paste Remembers Layers" is checked but when pasting the artwork it isn't pasted in the sublayers I copied them from.
Instead all the artwork elements I've copied pastes in the main layer of said sublayers when I try to paste to a different artboard. (all within the same document). When I paste on the same artboard I've copied from it will paste into the top sublayer.

-
Lucy, can't replicate, works fine for me, all objects get pasted right where I copied them from, no matter what paste command I use :(
It might be file-specific... can you share the file and record a video of how it works for you?