I have a QGIS 3.22.9 (Ubuntu Linux) layout. On export to PDF (or Tiff) a WMTS layer from the USGS National Map Services website will not show in the final export. Other vector data on top of the WMTS export fine, as do the map features like scale bars and grids.
Interestingly, a WMS (c.2000 USGS Topo maps) will export There is no change in scale. Both data are freely available from the USA National Map.
Below is a screen shot of the export options where 'Layers' is the WMTS.
Here is the URL for the WMTS data that will not export.
Here is the URL for the WMS data that will export.
The layout is scaled to 1:20000. The CRS is WGS84/UTM12N or EPSG 32612.
Why will the WMS export fine but not the WMTS?