The workaround detailed here by Milos (@miloss84) and proposed there by wordregisteron (@wordregisteron) works well!
It’s the same one as the one offered by Lawrence Joe (@laranz) two messages up.
By applying the workaround mentioned by wordregisteron (@wordregisteron) and detailed by Milos (@miloss84), changes made using the Gutenberg editor are saved without issues while using the latest version of Elementor (4.3.4).
It is no longer necessary to retrograde to Elementor version 4.2.4.
Many thanks for suggesting this solution.
Best regards.
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This reply was modified 18 hours, 31 minutes ago by GeoTarn. Reason: Mark as resolved !
I made exactly the same observation as tiger1609 !
I had to downgrade the Elementor plugin to version 4.2.4 to restore proper functionality.
This is not satisfactory regarding security updates.