Marking related Tasks complete through CSOM sets the dates for some tasks to 1/1/1984

Question

Marking Tasks complete through CSOM sets the dates for some tasks to 1/1/1984. Has someone seen this?

Is this something related to deadlock on reosurces?

Answer 1

This was reported to MS Support and a fix for this problem is underway and would be released in updates to Project Online

Answer 2

The has been resolved in March 2017 fixes