Unexpected system principal in sessions triggered by comment creation events

When creating a comment, automation scripts triggered by the following events are run as the "system" principal instead of the acting user i.e.

On CommentRoot:

• aboutToCreate
• beforeDocumentSecurityModification
• documentSecurityUpdated
• documentCreated

On Comment:

• aboutToCreate
• documentCreated
• beforeDocumentModification (to update relatedtextresources)
• documentModified

On original document:

• commentAdded

I'm particularly binding to the commentAdded event. I believe this session's principal should be the acting user, not "system".

Workaround:

Instead of using:

• CurrentUser.getPrincipal()
• Session.getPrincipal()
• input.doc.getPrincipal()

Use one of:

• var actingUser = ctx.Event.context.getPrincipal();
• var userManager = Fn.getUserManager();
  var principal = Session.getPrincipal();
  var actingName = principal.getActingUser();
  var actingUser = userManager.getPrincipal(actingName);