BUG: Adding dimension config to an existing CR does not work

[c4ll-m3-j4ck]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

When following the documentation at https://docs.neos.io/guide/content-repository/content-dimensions/migrating-dimension-config in order to add dimension-config to a neos-instance that didn't previously have a dimension config, the provided commands lead to an error and make it impossible to migrate the cr to the new dimensions.

After adding the configuration for the new dimensions, I ran ./flow content:refreshRootNodeDimensions. This worked fine and I can see the changes in the database as the dimensionspacepoints are created in db.cr_default_p_graph_dimensionspacepoints.

However, when I then run the next command ./flow content:moveDimensionSpacePoint '{}' '{"language": "en"}', the command fails with the error the content stream 0359b978-1f56-45b1-853e-078fa25c0a72 already contained nodes in dimension space point {"language":"en"} - this is not allowed.

Right not it seems like it is not possible to add dimensions to an already existing CR.

Expected Behavior

The nodes should be moved to the correct dimension.

Steps To Reproduce

No response

Environment

- Flow: 9.0.x-dev
- Neos: 9.0.x-dev
- PHP: 8.3

Anything else?

No response

[c4ll-m3-j4ck]

Some additional context:

It seems like that on running the first command, hierarchy-relations with the new dimensionspacepointhash are created.

In Neos\ContentRepository\Core\Feature\DimensionSpaceAdjustment\DimensionSpaceCommandHandler::requireDimensionSpacePointToBeEmptyInContentStream a check is run against the subgraph, which returns an existing node (Neos.Neos:Sites) in this case.