I just came across this issue myself (Windows 10 here) and wanted to post it. But while recreating it step by step, I found that you have to confirm every field change by pressing the Enter/Return key. Then the data persists and gets saved.
It still is a somewhat misleading behaviour. If I tab from one field to the next I can enter all the information but it gets lost on saving. This doesn't only apply to v1 documents opened in v2, by the way. This seems to be the general behaviour in v2.
Hi @Seraguithand Welcome to the Forums,
We are aware of this issue and have it logged with the Developers to resolve. As @thoroehas stated, the change will be accepted if you press Enter/Return after editing each field.
I've updated the report with a link back to this thread so we can update here when it's been resolved.
thoroe got a reaction from Seraguith in [Publisher 2.1.0] Document Information Fields (Author, Title, etc.) cannot be edited when file was migrated from V1 (?)