pattrstorage lost data when changing/saving a bpatcher

Hi,

I need some help to find a good way to work with a patch that I continue to ameliorate and that I'm already using with some presets in a project.

My main patch contains a pattrstorage, and several copies of the same bpatcher. It works fine until I open, (modify) and save the original bpatcher : pattrstorage doesn't keep the data saved before modifying the bpatcher.

I put here a simple example, with the bpatcher not embed in the main patch;
because that's what I want : beginning to save presets and still have the possibility to do changes easily/rapidly in the bpatcher that will be applied to all the copies.

the main patch:

the very simple bpatcher :

we can see also in the storagewindow that pattrstorage lost sometimes some objects linked to their autopattr, or just keep elements of one copy in its list.

Is there a special attribute for this (I've tried some), or is it a bad procedure?

Thanks.

L.