Sharing instance of proxy object across processes results in pickle errors

Hello

I'm trying to understand if a SyncManager proxy object instances are supposed to be shareable accoss processes, and if so, how

Bug report

See https://github.com/python/cpython/issues/101320#issuecomment-1404187868 below

What I'm doing is the following:

• create a new sync manager, and use it to populate a proxy dictionary from the initial process
• in another process, connect to the sync manage, and read in a load the data from the proxy dictionary
• we read corrupted data out of the connection to the manager

Is this a bug or something that should be possible to do in python ?
I assume that the objects in syncmanager can be accessed through several processes, is it true ?
If so, what is the proper way to do it ? (I think that just using the same reference of proxy object accross forked processes is not supposed to work)

Your environment

python 3.9

Start with the SyncManager proxy-sharing scenario described in the report and read the linked issue comment for the observed pickle errors. Reproduce the sequence across processes on Python 3.9, then determine whether the corrupted data is expected behavior or a defect and document a confirmed outcome.