LinkItemCollection Media, Page items are not imported from the other site

I am using Episerver Import/Export data tools to export data from a website and import them to another website.

However, every property could be imported. But not the below LinkItemCollection property,

[CultureSpecific]
[Display(
  Name = "Resource files",
  Description = "Resource files",
  GroupName = SystemTabNames.Content,
  Order = 85)]
public virtual LinkItemCollection ResourceFiles { get; set; }

When I export and import the page to the website, each and every property comes to the website. But LinkItemCollection property items are not correctly imported.

After importing, I could see in the Episerver page edit mode, the LinkItemCollection items have been imported. But when I clicked on them and go to the 'Edit link', it displays 'Link name/text' correctly and the link to the Page or Media is missing (empty field; please refer the screenshot below). However, the External links import in the LinkItemCollection works as expected.

How do I import LinkItemCollection items with Page or Media values?

Does the Episerver export tool export Page references and Media files in LinkItemCollection items?

What causes this?