After upgrading from 3.1.1-4 to 3.2.0-3, DOI settings not fully migrated

I recently upgraded from OJS 3.1.1-4 to 3.2.0-3. First testing cycle done, before moving to live.
Found the following issue:

We have DOI plugin in source 3.1.1-4 OJS instance. DOI plugin settings in 3.2.0-3 inherited all source parameters, except the publishing objects selection, which came empty (no check box selected from Articles, Issues, Galleys).
We had “Articles” selected in source 3.1.1-4, but in 3.2.0-3 is not selected.

Any idea what went wrong and how can I solve it?
Thanks in advance for your reply.