Header lost when different layout in sections

Hello,
Given a word file with 3 sections (numbered for the example 1,2,3).
All sections have the same tag in the “header”.
The section 2 (middle) has a “landscape” layout.
Sections 1 and 3 have a “portrait” layout.

One replace the tag by a text in all the document, and when one save the file in PDF, the header of section 2 (middle) disappears.

Any help would be very appreciated

Regards,
Stéphane

@stephane.moinard Could you please attach your template and output document along with code that will allow us to reproduce the problem on our side/ We will check the issue and provide you more information.