Divi Themer can be used to create custom headers and footers.
These work well with versions of Toolset WooCommerce Blocks up to version 2.9.4.
But after upgrading to version 3.0 (current version 3.1) the custom header and footer no longer appear on the shop page if a custom archive is created with Toolset for products (i.e. the shop page).
The issue is currently under investigation, we do not have a workaround.
The only advice is to avoid upgrading WooCommerce Blocks beyond version 2.9.4 for the time being.