If the odp document have an hyperlink to other slide in the same document, when before there are some hide slides, then the hide slides are removed and change the number slide of the destination slide but the hyperlink don't change. The result is that the hyperlinks are wrong.
Here you see a odp file with 5 slides, the slide 3 is hidden. In slide 1 we have 2 links, one to slide 2 and other to slide 4.
links.odp
If I use Expand-Animations with this file, then the second link go to slide 5
links.pdf
If the odp document have an hyperlink to other slide in the same document, when before there are some hide slides, then the hide slides are removed and change the number slide of the destination slide but the hyperlink don't change. The result is that the hyperlinks are wrong.