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Thank you, i didn't find anything interesting in the debug.log
But with the help of IA i found out the culprit is Wordfence that is blocking this action by the editor. I could solve it

Thanks again for your help

Hello again, I managed to update the plugin to latest version, but the issue persists,
please see screenshot here: https://www.dropbox.com/scl/fi/qqel9jwrg42f2t6ujw5g4/Captura-de-pantalla-2025-09-03-a-las-23.59.08.jpg?rlkey=dsiw338e7bizodq0uhd3zpoyc&dl=0

FYI, same alert appears when clicking "Create a relationship", "create a view" and "create a settings page" even though I was not using any of these.
It works ok when clicking "create a custom post type" and "create a taxonomy", items that are also displayed correctly in the plugin menu on the wp admin sidebar

Yes, I have done the reset for permalinks several times, with no luck,
any other suggestion=