"L" shaped elements cover and prevent the selection and identification/specs of everything below them.
Please look at this XD "Design Specs" file:
The "L" shaped elements (colored RED and FUCHSIA in the file) cover and prevent the selection of and identification of the specs, of everything below them. Even though these "L" shaped elements are not closed shapes they cover everything below them (BTW, it's the same when there is a surrounding border that is above everything else, layer wise).
Please, this must be corrected.
The attached file was "Exported" to PDF.
Vertika Gupta commented
Thanks for helping us in making XD more user friendly. For new idea or new feature request, please use the link https://adobexd.uservoice.com/forums/353007-adobe-xd-feature-requests, XD people will pick it asap through mentioned link.