Is theres something correct in this part of the LR ?
http://developer.xojo.com/userguide/vector-graphics$saving-and-loading-vector-graphics(I do not think so, but I may be wrong).
Nothing.
Save As Vector export the passed objects into a (flat) bitmap png file.
Open As Vector do nothing (not the correct vector file format)
Go away, nothing to see here 
The only way to keep the vector data is to print them to pdf (but you have to do it properly, else you get bitmap artwork). I do not tried to read these vectors from the pdf file.
I had no time to check but I expected such a result. Thank you for taking time to check and tell us
Vector graphics into and out of images doesn’t seem to have worked for years.
PICT files are deprecated by Apple, and EMF is very rarely used in Windows.
SVG ??