Failed to invoke operation Blob.Convert, Converter office2pdf is not available

Using template rendering to render output pdf format on LTS2019 throws error:

Failed to invoke operation Blob.Convert, Converter office2pdf is not available

Steps to reproduce the issue:

1 - Upload a template 
2 - Set rendering output format to PDF in template configuration
3 - Call the operation javascript.RenderPdf (this chain is provided by the template rendering add-on) to render a document using the template ==> you get the error: 

Failed to invoke operation Blob.Convert, Converter office2pdf is not available

Workaround:
Workaround 1:
Set rendering output format to DOCX in template configuration ==> renders the document in Word with no issue.

Workaround 2:
Keep the rendering output format to PDF and add...

<sourceMimeType>application/pdf</sourceMimeType>

..to "any2pdf" converter xml contribution and call javascript.RenderPdf ==> renders the document in PDF with no error.

 (Nuxeo 10.10)