oData Query To Dynamics 365 Does Not Fold

Hi!

I want to generate a table in Excel with Power Query. For this I need to map external (vendor) article numbers to our internal article numbers. I request the latter from our Dynamics 365 instance, buffer it with Table.Buffer() and then merge it with a bunch of other stuff. But the query takes forever to complete, because it doesn't fold and the table in Dynamics is huge.

Here is a simple example query that does not fold.

let
    Source = OData.Feed("https://xxx.operations.dynamics.com/data", null, [Implementation="2.0"]),
    VendorProductDescriptionsV2_table = Source{[Name="VendorProductDescriptionsV2",Signature="table"]}[Data],
    #"Select Columns" = Table.SelectColumns(VendorProductDescriptionsV2_table,{"ExternalItemId", "ItemNumber"}),
    #"Filter Rows" = Table.SelectRows(#"Select Columns", each [ExternalItemId] = "F000_68465165848"),
    GetMetadata = Value.Metadata(#"Filter Rows"),
    QueryFolding = GetMetadata[QueryFolding]
in
    QueryFolding

IsFolded is FALSE in the result. The query is so simple, how can this be?

Help would be much appreciated, since the query takes sooooo long that what I'm building is basically unuseable.

Best regards,

Julian