Looks simillar to but not working in new version.
If you created and saved JQL based custom timesheet with JQL query for example "assignee = currentUser() ".
And then you add it to main menu, than if you try to open it from main menu it will open timesheet page but show error (picture attached) and clear JQL query. If I open from that place list of custom timesheets, choose it, and push "Apply" that it works, but not from main menu.
I found that with operator "in (%some_user_name%)" it works, but not with "=".