Have realtime DirectQuery working as intended - Update a query that combines multiple queries?

Hi everyone,

I've followed a tutorial (https://www.youtube.com/watch?v=iyGBZsLxe54) using Play Axis to have my report refresh my DirectQuery datasets in realtime (~10 seconds). This works very well for when I'm simply putting my data straight from the origin database into a table, however I have a query which combines data from multiple queries into one table, that does not update with the DirectQueries.

let
    Table1 = Table.AddColumn(Table.LastN(#"TABLEfromDIRECTQUERY1",5000),"reference",each "DIRECTQUERY1"),
    Table2 = Table.AddColumn(Table.LastN(#"TABLEfromDIRECTQUERY2",5000),"reference",each "DIRECTQUERY2"),
    Table3 = Table.AddColumn(Table.LastN(#"TABLEfromDIRECTQUERY3",5000),"reference",each "DIRECTQUERY3"),
    Source = Table.Combine({FilterTable1, FilterTable2, FilterTable3})
in
    Source

My visuals use data from this 'merging' query to plot data, so when this query doesn't update with the inidividual tables, my visuals do not work. I would've thought that this query should update as its comprising elements update, however this does not appear to be the case. Does anyone have any advice on how I can get this combined table to refresh with the smaller tables? Thanks.