When creating a new task using maniphest.createtask, whether in code or via online Conduit form, the email notification subject always says "Reopened". For example, I just created T6225 using Conduit form on this site and the email I got had this subject:
[Maniphest] [Reopened] T6225: Test Conduit Task 2
Man, now I wish I created THIS task that way - that would be so meta :)