Problem:
Site audit error: WPV-pages have no self-referencing hreflang

Solution:
However, irrespective of what tool/plugin you are using, the thing is that the pages reported as missing the self-referencing hreflang links are search results and paginated View results.

As such, they are not necessarily equivalent to a similar page in the other language anyway, and it may not be appropriate to add hreflang links on such pages. (A similar search in different languages may produce different results.)

You can fine proposed solution in this case with the following reply:
=> https://toolset.com/forums/topic/site-audit-error-wpv-pages-have-no-self-referencing-hreflang/#post-2045841

Relevant Documentation: