After winter'21 release as Edit, Delete, Modify all and View all permission has been revoked from the Guest user profile (Unauthenticated) so as to make custom VF pages work unauthenticated and to perform edit operation ignoreEditPermissionForRendering (Salesforce Suggestion (https://help.salesforce.com/articleView?id=release-notes.rn_networks_guest_user.htm&release=228&type=5)) parameter has been added to all the Apex Inputfields but even after that when we try to update records we are getting error like this.

Any help would be much appreciated.

After winter'21 release as Edit, Delete, Modify all and View all permission has been revoked from the Guest user profile (Unauthenticated) so as to make custom VF pages work unauthenticated and to perform edit operation ignoreEditPermissionForRendering (Salesforce Suggestion (https://help.salesforce.com/articleView?id=release-notes.rn_networks_guest_user.htm&release=228&type=5)) parameter has been added to all the Apex Inputfields but even after that when we try to update records we are getting error like this.

Any help would be much appreciated.