Fields do not show in views when Search API indexing is of type multiple

Hi,

This could be a Search API or views issue.

When using the following configuration of versions of:

Search API, Search API db
Search API combined
A search index of multiple types (Nodes + Fields)

When I use a combined field of, for example the timestamp of the file and the created date of the node, this field is not available on the fields list of my Search indexed view.

Could this be a bug? Most relevant issue is here:
https://www.drupal.org/project/search_api/issues/2828883
but I'm not sure this is an issue with the Search API or Search API combined module.