fix for importing inner element fields

[i-just]

Description

Commit 27dac31 fixed an issue where matrix element inner fields were using the first set of data for all elements, but it broke “simple” inner element field import. This PR fixes it while keeping the inner fields for elements in a matrix field working as expected.

Related issues

#1378

[fgd007]

Awesome @i-just, works! 🙏

[fgd007]

Unfortunately, on further inspection, it didn't seem to do exactly the right thing.
For me content for the assets got mixed up.

In a matrix field with this (pseudo)structure below it will mix up the 'fields'-index with 'fields filtered by asset matrix block'-index.

Resulting in a caption 'Lorem 2' on the first asset field (Field index 1, Asset index 1).
I'm not sure if this has to do with your fix or whether this is unrelated.

{
  "fields": [
    {
      "Text": "Lorem ipsum"
    },
    {
      "ImageUrl": "https://url",
      "Caption": "Lorem 1"
    },
    {
      "Text": "Lorem ipsum"
    },
    {
      "ImageUrl": "https://url",
      "Caption": "Lorem 2"
    },
    {
      "Text": "Lorem ipsum"
    },
    {
      "ImageUrl": "https://url",
      "Caption": "Lorem 3"
    }
  ]
}

[i-just]

@fgd007 can you please open a new issue about this and provide reproduction steps? The structure of your matrix field and an example of your feed snippet would be very helpful.