Subfolders trashed/untrashed by user "system" instead of real user

Preparation steps

• Take a hotfixed Nuxeo 9.10 instance (e.g. to HF44) and install WebUI
• In a project -> Designer, add the contribution https://doc.nuxeo.com/nxdoc/910/hotfixes-installation-notes-for-nuxeo-platform-lts-2017/#trash-flow ans install the project
• In a Workspace, create a Folder D1. In D1, create a sub-Folder D2. In D2, create a sub-subFolder D3

How to reproduce

• login as Administrator
• in the Workspace, select D1 and trash it.
• in the Workspace trash, select D1 and untrash (restore) it
• in restored D1, look a the history: restored by Administrator
• in restored D2, look a the history: restored by system
• in restored D3, look a the history: restored by system

In D2 and D3, the user having restored should be Administrator. This is what happens on nightly.nuxeo.com and 10.10 GA