When exporting to DWG cross section disappear

Hi,

I have a problem with a cross-section in a large assembly (several dozen for assemblies, a few sets of details) When I make a cross-section in solidworks, the cross-section view looks like below:

At the top and bottom of the section F-F you can see something like "shading".

When exported to DWG, results is a lack of cross-section, only a view of the wall from the outside, like below:

I tried to change in the assembly&drawing:

- enable/disable speedpack

- enable/disable "unloaded" mode

- changing the sheet format

- reload drawing

- the assembly has no errors

Any suggestions what could be the reason?

SolidworksDrawings And Detailing