This is PPT bug for fileopen bug 65724 and filesave bug 54037 resolved for PPTX.
Open PPT attachment 80790 [details] from bug 65724.
See that links are there but not visually fine ("page" should not be superscript, should look like MSO in attachment 169256 [details]).
Some clicking works, some not, test both in edit mode with Ctrl (2nd page doesn't go to 3rd) and in presentation mode (2nd to 3rd, 2nd to Title, 4th to Title etc).
After fileopen is fixed, filesave should also work.
Additionally verify with test files attachment 128330 [details] from bug 54037.
Created attachment 171672 [details]
4th PPT example
PPT image with hyperlink is also not imported in LO, example PPT attachment 171643 [details] (from PPTX bug 91643).
Further PPTX example in bug 141704 should also be tested, here is PPT variant.
This is a duplicate of bug 142461, isn't it ?
*** This bug has been marked as a duplicate of bug 142461 ***
This is PPT,not duplicate of PPTX.