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It's possible the CSV was not saved properly after editing. Check that the edits are in the CSV, and that there were no backend errors in the DSpace logs (which would be an indication of an invalid or corrupted CSV file)
Depending on the version of DSpace, you may be encountering this known bug with processing linebreaks in CSV files: https://github.com/DSpace/DSpace/issues/6600
If you are setting a new embargo date in the CSV, ensure that the embargo lift date is a future date. It's been reported that past dates may cause DSpace to ignore item changes.

Consider the following page for this topic: Configurable Entities

In DSpace 7, we have entities. Entities are items with an entity type (there can still be items without an entity type).
Two entities can be linked to each other. For this purpose relations are defined, which indicate the relationship between the entities. Relationships between two entities are defined by the metadata schema relation. The relation reflects how two entities are related to each other, for example isPersonOfProject or isPublicationOfAuthor.
Until the introduction of entities, we could only link items to each other by inserting DOIs or URLs of other items into metadata fields dc.relation.*. What is new about the linking between entities in DSpace 7 is that UUIDs are entered into the fields, i.e. internal identifiers of other entities that DSpace can easily resolve. DSpace "knows" which entities are linked to each other and how.
On the item view of an entity (remember: an entity is an item with an entity type) metadata of other entities can be displayed. DSpace refers to this as virtual metadata. Virtual metadata does not belong to the item in whose item view it is displayed, but to a linked entity. They can be changed only in the linked entity. As an example: we have the entities journal and journal issue. All journal issues display the title of the journal in their item view. This title is stored only in the journal and is only (dynamically) displayed in the issues.

Virtual metadata is exported with the entities in which it is included. For example, when you export projects, you see a column for the project.investigator field. This contains values such as <lastname1>, <firstname1>::virtual::8585::600||<lastname2>, <firstname2>::virtual::27946::600. Here, the names of two people have been included as virtual metadata. However, the names are not stored in the project, but exported from the respective person entities at the time of export. The specification ::virtual:: marks this. The specifications ::8585:: and ::27946:: are examples for this documentation and represent IDs of the relations. The specification ::600 comes from the DSpace Authority, which is also specified due to technical circumstances.
The relation itself is also included in the CSV export, in the relation.isPersonOfProject field for example with the value d89c1eb1-2e7c-4912-a1eb-f27b17fd6848::virtual::8585::600||e3595b14-6937-47b9-b718-1972cb683943::virtual::27946::600. Additionally, a relation.isPersonOfProject.latestForDiscovery field is created. This field has internal reasons in DSpace and should help to make things faster discoverable. In the fields you again see the ::virtual::8585::600 specification, which are already explained above. Instead of the values of individual metadata fields, you now have the UUIDs of the items that are linked. You can always get these UUIDs from the URL of the item view of an item.

As always, only the columns and rows that will be changed should be specified. You do not want to import the columns that contain virtual metadata, because they are not stored in the imported items, but in the linked items. So in the above example you don't want to import the project.investigator column, but delete it from the CSV.
To link one item to another you need to create a corresponding column of the relation metadata schema, so in our example above relation.isPersonOfProject. All columns of the form relation.*.latestForDiscovery are created and updated automatically, so you don't want to import them. If you want to create a new relation, of course you don't know the ID of the relation, you can replace it with a +, then DSpace will assign it on its own. For example, a valid new entry in the relation.isPersonOfProject column might then look like this: d89c1eb1-2e7c-4912-a1eb-f27b17fd6848::virtual::8585::600||e3595b14-6937-47b9-b718-1972cb683943::virtual::27946::600|6161f668-af7e-4696-aad8-99430426619a::virtual::+::600. This would additionally specify the person whose UUID is 6161f668-af7e-4696-aad8-99430426619a as the project's investigator. Of course, people can also be removed from the column or completely new relations can be created for new items, even if there are no old ones to be taken over.

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