[Fechado] Hreflang page doesn't link out to itself

Background of the issue:
We are using the slug translations feature in WPML, which works great. However, we have an issue with HREFLANG links on our pages. Specifically, we have cases where two URLs work for the same page.

Symptoms:
The HREFLANG on any page should link to itself, but in some cases, it does not. For example, a French language page uses the English slug, and the HREFLANG has a French slug which we expect to redirect to the correct French URL.

link oculto
which is the French language but uses the English slug

Should redirect to link oculto

Questions:
How can we ensure that the HREFLANG on any page links to itself correctly?