Comment 1 for bug 166245

Should not happen. I tested a few files and cannot reproduce
that. You'll have to submit a sample file that demonstrates
this (please always attach samples when reporting bugs, it
helps a lot!).

One possibility is that you have the "transform gradients"
button on the controls bar off and do paste (Ctrl+V). This
button off means that all gradients stay unmoved relative to
the canvas, when the objects that use them move. Pasting, on
the other hand, consists of pasting into the original place
and then moving the pasted object under the cursor. With
"transform gradients" off, this move will indeed break
gradient placement. What you need to do is either switch
"transform gradients" on, or use Paste in place (Ctrl+Alt+V,
does not do any moving, just pasting it to the same place
where it was copied from) instead of simple Paste.