Page protection doesn’t matter anymore

Hi,
The plugin has been set up on 2021 April. The chosen system was the “Page Protection” (+ password) mode, that permit to see a part of the page “visible” (short description) and the other part is locked (long description). The other mode with de “Global Protection” was not the good solution for our need, because we have to see a part of the page.
But since few days, (a link with the last automatic update?), the system does not matter anymore : the protection is like the “Global Protection”. So we have the possibility to insert the code before and after our private content like this : [passster …] content [/passster]
But I think there is a better solution. Do you know the cause of this problem?
We work with the classi editor.
Link to a classic product page : https://artampo.fr/produit/bouteille-thermos-05-l/
(in admin, only the Page protection is on)
Link to a product page with my new temporary code like “[passster …] content [/passster]” (you can see the bottom locked are : https://artampo.fr/produit/masques-adulte-tissu-blanc-120-lavages-transfert-numerique/
(in admin, Page protection is off)

The page I need help with: [log in to see the link]