Redmine: Manager.GetObject(Of Issue)(<No>, <Params>) does not work from api version 4.6.6.0

[vbnetredmine]

Hello,
Up to api version 4.6.5.0 this still worked:

Dim oThisIssue As Issue
Dim sTicketNo as String = "123"
'(oManager is assigned)
Dim oParameters = New System.Collections.Specialized.NameValueCollection
                oParameters.Add(RedmineKeys.INCLUDE, RedmineKeys.WATCHERS)
                oParameters.Add(RedmineKeys.INCLUDE, RedmineKeys.RELATIONS)

oThisIssue = oManager.GetObject(Of Issue)(sTicketNo, parameters:=oParameters)

The same does not work from api version 4.6.6.0:
oThisIssue = oManager.GetObject(Of Issue)(sTicketNo, parameters:=oParameters)
It comes Error "Redmine.Net.Api.Exceptions.NotFoundException" in redmine-net-api.dll

I don't know what to do anymore.
What can I do to read oThisIssue?

The Redmine-version is: