thanks it's working and very simple, my problem is solved.
I noticed however that to add innerblocks i have:
1: create at least 1 custom field in the block group
2: custom field created must be not be empty
3: i have to be in preview mode
otherwise in gutenberg backend i see notice: Click the Edit icon in the block toolbar to enter content.
(Added screenshot to explain better): https://imgur.com/a/V6oRzW5
There is a way to add innerblocks without this requirements? (i'm trying to create a container for other custom blocks)
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