[Geschlossen] Translation Missing

Background of the issue:
I have a post in English (source language) that I want to translate into Arabic and Spanish. Arabic translation went OK. Spanish translation is not showing. Once I finish the translation into Spanish, I keep getting the "+" symbol, although the Translation Management indicates that the English->Spanish translation is completed. I have already tried all the usual workarounds like, cancelling the translation, updating the English content and re-translate into Spanish, it didn't work. Dražen Duvnjak from WPML support suggested: https://wpml.org/forums/topic/object-cache-pro-causing-wpml-issues/page/2/#post-14302565 I tried but did not work.

Symptoms:
Spanish translation is not showing and the "+" symbol appears despite Translation Management indicating completion.

Questions:
Why is the Spanish translation not showing despite being marked as completed in Translation Management?
What additional steps can I take to resolve the issue of the Spanish translation not displaying?