Hello and thank you for the follow-up.
I proceeded as you suggested by rebuilding this section. The result was not conclusive.
Let me explain. The section concerned is Latest One. Here is its architecture
Heading
Heading
Product list.
---Badge
---Thumbnail
---Add to cart
---Title
---Price
I rebuilt on this configuration and it was impossible to save.
By deleting a Heading so the configuration below it is possible to save
Heading
Product list.
---Badge
---Thumbnail
---Add to cart
---Title
---Price
But as soon as i edit a parameter of this section, saving is again impossible.
Therefore, the problem remains and is still not resolved.
It would be wise for you to look into this in depth, as it is a recurring problem.
Thanks