Dataflow - linked entities in the same workspace - refresh not working automatically

Hi,

We have 3 dataflow entities in the same workspace, say:

1. Entity1 contains history data
2. Entity2 contains live data
3. Entity3 uses Entity1 and Entity2 as linked entities to append them together (Entity1 and Entity2 have exactly the same column names and number of columns)

Based on the link below, the refresh logic should work automatically for Entity3 given all these entities are in the same workspace:

https://docs.microsoft.com/en-us/power-bi/service-dataflows-linked-entities

However, this is not happening in the case above. We need to refresh Entity 3 manually after the scheduled refreshes of Entity1 and Entity2 given they have enough time intervals in between.

Could someone please help by explaining why?