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This question is answered, and I decided to publish the solution to help other developers.
I searched one solution to one problem with intervalmatch about how desappears the values not matched .
For me it was a problem, because that missing values help me to find mistakes in the tables of origins.
At the end the problem is the position you write in the script the tables.
I attached one example where you can see the effect produced when you change the position of the two tables in the script.
I hope it will be helpfully for somebody.