Why IsMilestone Task property Can I set on second publication via CSOM?

Question

Why IsMilestone Task property Can I set on second publication via Project server CSOM?
Hello.

Why IsMilestone Task property Can I set on second publication via Project server CSOM?

I have this code:

csom.DraftProject draft = project.CheckOut();
context.Load(draft.Tasks, dt => dt.Where(t => t.Id == taskUID));
context.ExecuteQuery();
csom.DraftTask task = draft.Tasks.First();
task.ActualStart = task_Act_Start;
task.ActualFinish = task_Act_Start;
task.PercentComplete = 100;
task.IsLockedByManager = true;
task.IsMilestone = true;
draft.Update();
csom.JobState jobState = context.WaitForQueue(draft.Publish(true), Consts.DEFAULTTIMEOUTSECONDS);

BUT task.IsMilestone = true; works only after second publication:

csom.DraftProject draft = project.CheckOut();
context.Load(draft.Tasks, dt => dt.Where(t => t.Id == taskUID));
context.ExecuteQuery();
csom.DraftTask task = draft.Tasks.First();
task.IsMilestone = true;
draft.Update();
csom.JobState jobState = context.WaitForQueue(draft.Publish(true), Consts.DEFAULTTIMEOUTSECONDS);

How can I do it with one publication?

Answer 1

Hi @Vasily Zaytsev ,
Since your issue is about Project online. Microsoft has a dedicated forum to discuss about Project online. You can get some more professional advice in the forum.
https://techcommunity.microsoft.com/t5/project/ct-p/Project

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Answer 2

Hi @RaytheonXie_MSFT ,
First, I send this question on dedicated forum, but there is no answer.