HeadingType is not applied when using Load()

[PrzemyslawKlys]

This works - new document

Import-Module PSWriteWord -Force

$FilePath = "$Env:USERPROFILE\Desktop\PSWriteWord-Example-TableOfContent3.docx"

$WordDocument = New-WordDocument -FilePath $FilePath
$Toc = Add-WordTOC -WordDocument $WordDocument -Title 'Table of content' -HeaderStyle Heading2
Add-WordSection -WordDocument $WordDocument -PageBreak
Add-WordText -WordDocument $WordDocument -Text 'This is my first title' -HeadingType Heading1
Add-WordSection -WordDocument $WordDocument -PageBreak
Add-WordText -WordDocument $WordDocument -Text 'This is my second title' -HeadingType Heading1 -Color Red -CapsStyle caps
Add-WordSection -WordDocument $WordDocument -PageBreak
Add-WordText  -WordDocument $WordDocument -Text 'This is my third title' -HeadingType Heading2 -Italic $true -Bold $true
Save-WordDocument $WordDocument

### Start Word with file
Invoke-Item $FilePath

This doesn't work - Load document

Import-Module PSWriteWord -Force

$FilePath = "$Env:USERPROFILE\Desktop\PSWriteWord-Example-TableOfContent7.docx"
$FilePathTemplate = "$PSScriptRoot\Templates\WordTemplate.docx"

$WordDocument = Get-WordDocument -FilePath $FilePathTemplate
$Toc = Add-WordTOC -WordDocument $WordDocument -Title 'Table of content' -HeaderStyle Heading2
Add-WordSection -WordDocument $WordDocument -PageBreak
Add-WordText -WordDocument $WordDocument -Text 'This is my first title' -HeadingType Heading1
Add-WordSection -WordDocument $WordDocument -PageBreak
Add-WordText -WordDocument $WordDocument -Text 'This is my second title' -HeadingType Heading1 -Color Red -CapsStyle caps
Add-WordSection -WordDocument $WordDocument -PageBreak
Add-WordText  -WordDocument $WordDocument -Text 'This is my third title' -HeadingType Heading2 -Italic $true -Bold $true

$WordDocument.Xml
Save-WordDocument $WordDocument -FilePath $FilePath

### Start Word with file
Invoke-Item $FilePath

This issue was reported by me - xceedsoftware/DocX#245