This thread is resolved. Here is a description of the problem and solution.
Problem: If I enter the translation, I can see it’s completed, but still it does not show among the translated pages. I can see the pages over Translation Management as complete.
Solution: #1 Install under Plugins -> All Plugins the "Duplicate Post" plugin #2 Clone the affected page/portfolio using "Duplicate" when moving the mouse cursor to the page #3 Delete the old page/portfolio #4 Publish Draft #5 Finish translation with 100% (You will not lose the saved translations)
Relevant Documentation: https://wordpress.org/plugins/duplicate-post/
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