Formatting Lost When Creating List Item

I'm trying to create a list item but the most basic formating is being removed from the input. Field type is Multiple lines of text and I've tried using Plain, Rick and Enhanced.

Script to create a list item and populate a field:

        $List = $Context.Web.Lists.GetByTitle($listTitle)
        $Context.Load($List)
        $Context.ExecuteQuery()

        $ListItemInfo = New-Object Microsoft.SharePoint.Client.ListItemCreationInformation 
        $ListItem = $List.AddItem($ListItemInfo)

        $ListItem = $List.AddItem($ListItemInfo)
        $ListItem["Title"] = $myVar.Title
        $ListItem["BodyStuff"] = $myVar.SomeStuff   
        $ListItem.Update()  
        $Context.ExecuteQuery()

myVar.SomeStuff is populated with the following

Hello blah,

This is a test message.

Thank you, blahblah

some other random text

When the item is created in SharePoint, the value of myVar.SomeStuff is compressed together removing any line breaks or formatting.

BodyStuff will look like this:
Hello blah, This is a test message. Thank you, blahblah some other random text